Introduce the units measure for the size of the entry in the zip archive (dotnet#9936)

Author: kaypee90

xml/System.IO.Compression/ZipArchiveEntry.xml

@@ -157,7 +157,7 @@ If the comment byte length is larger than <xref:System.UInt16.MaxValue>, it will
         <ReturnType>System.Int64</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>Gets the compressed size of the entry in the zip archive.</summary>
+        <summary>Gets the compressed size, expressed in bytes, of the entry in the zip archive.</summary>
         <value>The compressed size of the entry in the zip archive.</value>
         <remarks>
           <format type="text/markdown"><![CDATA[  
@@ -435,7 +435,7 @@ If the comment byte length is larger than <xref:System.UInt16.MaxValue>, it will
         <ReturnType>System.Int64</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>Gets the uncompressed size of the entry in the zip archive.</summary>
+        <summary>Gets the uncompressed size, expressed in bytes, of the entry in the zip archive.</summary>
         <value>The uncompressed size of the entry in the zip archive.</value>
         <remarks>
           <format type="text/markdown"><![CDATA[