Commenting Fill<T>(T[], T, Int32, Int32) overload (#3245)

* Commenting Fill<T>(T[], T, Int32, Int32) overload

Added description to parameters and summary.

* Updated comments

Updated wording of the description to match commenting of similar methods.

* Removed bad XML element.

* Update xml/System/Array.xml

Co-Authored-By: Andy De George <[email protected]>

* Update xml/System/Array.xml

Co-Authored-By: Andy De George <[email protected]>

Author: FarhadShariatzadeh

xml/System/Array.xml

@@ -2766,10 +2766,10 @@
         <Parameter Name="value" Type="T" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <typeparam name="T">To be added.</typeparam>
-        <param name="array">To be added.</param>
-        <param name="value">To be added.</param>
-        <summary>To be added.</summary>
+        <typeparam name="T">The type of the elements of the array.</typeparam>
+        <param name="array">The <see cref="T:System.Array" /> to be filled.</param>
+        <param name="value">The new value for the elements in the specified range.</param>
+        <summary>Assigns the given <paramref name="value"/> of type <typeparamref name="T"/> to the elements of the specified <paramref name="array"/>.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -2806,12 +2806,13 @@
         <Parameter Name="count" Type="System.Int32" Index="3" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <typeparam name="T">To be added.</typeparam>
-        <param name="array">To be added.</param>
-        <param name="value">To be added.</param>
-        <param name="startIndex">To be added.</param>
-        <param name="count">To be added.</param>
-        <summary>To be added.</summary>
+        <typeparam name="T">The type of the elements of the array.</typeparam>
+        <param name="array">The <see cref="T:System.Array" /> to be filled.</param>
+        <param name="value">The new value for the elements in the specified range.</param>
+        <param name="startIndex">A 32-bit integer that represents the index in the <see cref="T:System.Array" /> at which filling begins.</param>
+        <param name="count">The number of elements to copy.</param>
+        <summary>Assigns the given <paramref name="value"/> of type <typeparamref name="T"/> to the elements of the specified <paramref name="array"/> which are 
+          within the range of <paramref name="startIndex"/> (inclusive) and the next <paramref name="count"/> number of indices.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>