fix grammar (dotnet#3127)

Author: mairaw

xml/System.Text.Json/Utf8JsonWriter.xml

@@ -3081,7 +3081,7 @@ Writes the <xref:System.Guid> using the default <xref:System.Buffers.StandardFor
 
 ## Remarks
 
-The property name and value is escaped before writing.
+The property name and value are escaped before writing.
 
           ]]></format>
         </remarks>
@@ -3117,7 +3117,7 @@ The property name and value is escaped before writing.
 
 ## Remarks
 
-The property name and value is escaped before writing.
+The property name and value are escaped before writing.
 
           ]]></format>
         </remarks>
@@ -3153,7 +3153,7 @@ The property name and value is escaped before writing.
 
 ## Remarks
 
-The property name and value is escaped before writing.
+The property name and value are escaped before writing.
 
           ]]></format>
         </remarks>
@@ -3341,7 +3341,7 @@ Writes the <xref:System.Guid> using the default <xref:System.Buffers.StandardFor
 
 ## Remarks
 
-The property name and value is escaped before writing.
+The property name and value are escaped before writing.
 
           ]]></format>
         </remarks>
@@ -3377,7 +3377,7 @@ The property name and value is escaped before writing.
 
 ## Remarks
 
-The property name and value is escaped before writing.
+The property name and value are escaped before writing.
 
           ]]></format>
         </remarks>
@@ -3413,7 +3413,7 @@ The property name and value is escaped before writing.
 
 ## Remarks
 
-The property name and value is escaped before writing.
+The property name and value are escaped before writing.
 
           ]]></format>
         </remarks>
@@ -3604,7 +3604,7 @@ Writes the <xref:System.Guid> using the default <xref:System.Buffers.StandardFor
 
 ## Remarks
 
-The property name and value is escaped before writing.
+The property name and value are escaped before writing.
 
           ]]></format>
         </remarks>
@@ -3641,7 +3641,7 @@ The property name and value is escaped before writing.
 
 ## Remarks
 
-The property name and value is escaped before writing.
+The property name and value are escaped before writing.
 
           ]]></format>
         </remarks>
@@ -3678,7 +3678,7 @@ The property name and value is escaped before writing.
 
 ## Remarks
 
-The property name and value is escaped before writing.
+The property name and value are escaped before writing.
 
           ]]></format>
         </remarks>