add docs for win32 registry (#4082)

Author: Anipik

xml/Microsoft.Win32.SafeHandles/SafeMemoryMappedFileHandle.xml

@@ -115,8 +115,9 @@
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets a value that indicates whether the handle is invalid.</summary>
+        <value>
+          <see langword="true" /> if the handle is not valid; otherwise, <see langword="false" />.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>

xml/Microsoft.Win32.SafeHandles/SafeNCryptHandle.xml

@@ -158,8 +158,9 @@ Each open handle object can be thought of as being in one of three states:
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets a value that indicates whether the handle is invalid.</summary>
+        <value>
+          <see langword="true" /> if the handle is not valid; otherwise, <see langword="false" />.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>

xml/Microsoft.Win32.SafeHandles/SafePipeHandle.xml

@@ -120,8 +120,9 @@
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets a value that indicates whether the handle is invalid.</summary>
+        <value>
+          <see langword="true" /> if the handle is not valid; otherwise, <see langword="false" />.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>

xml/Microsoft.Win32.SafeHandles/SafeProcessHandle.xml

@@ -124,8 +124,9 @@
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets a value that indicates whether the handle is invalid.</summary>
+        <value>
+          <see langword="true" /> if the handle is not valid; otherwise, <see langword="false" />.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>

xml/Microsoft.Win32.SafeHandles/SafeRegistryHandle.xml

@@ -127,8 +127,9 @@
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets a value that indicates whether the handle is invalid.</summary>
+        <value>
+          <see langword="true" /> if the handle is not valid; otherwise, <see langword="false" />.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>

xml/Microsoft.Win32.SafeHandles/SafeX509ChainHandle.xml

@@ -107,8 +107,9 @@
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets a value that indicates whether the handle is invalid.</summary>
+        <value>
+          <see langword="true" /> if the handle is not valid; otherwise, <see langword="false" />.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>

xml/Microsoft.Win32/RegistryAclExtensions.xml

@@ -24,7 +24,7 @@
     </Attribute>
   </Attributes>
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Provides Windows-specific static extension methods for manipulating Access Control List (ACL) security attributes for registry keys.</summary>
     <remarks>To be added.</remarks>
   </Docs>
   <Members>
@@ -52,9 +52,9 @@
         <Parameter Name="key" Type="Microsoft.Win32.RegistryKey" RefType="this" />
       </Parameters>
       <Docs>
-        <param name="key">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="key">The existing registry key from which to obtain the security information.</param>
+        <summary>Returns the security information of a registry key.</summary>
+        <returns>The security descriptors of all the access control sections of the registry key.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -83,10 +83,10 @@
         <Parameter Name="includeSections" Type="System.Security.AccessControl.AccessControlSections" />
       </Parameters>
       <Docs>
-        <param name="key">To be added.</param>
-        <param name="includeSections">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="key">An existing registry key from which to obtain the security information.</param>
+        <param name="includeSections">The desired access control sections to retrieve.</param>
+        <summary>Returns the security information of a registry key.</summary>
+        <returns>The security descriptors of the specified access control sections of the registry key.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -115,9 +115,9 @@
         <Parameter Name="registrySecurity" Type="System.Security.AccessControl.RegistrySecurity" />
       </Parameters>
       <Docs>
-        <param name="key">To be added.</param>
-        <param name="registrySecurity">To be added.</param>
-        <summary>To be added.</summary>
+        <param name="key">An existing registry key.</param>
+        <param name="registrySecurity">The security information to apply to the registry key.</param>
+        <summary>Changes the security attributes of an existing registry key.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>