Document System.Globalization.UnicodeCategory.GetUnicodeCategory(int codePoint) (#3452)

* Document  System.Globalization.UnicodeCategory GetUnicodeCategory (int codePoint)

* Update xml/System.Globalization/CharUnicodeInfo.xml

Author: carlossanlop

xml/System.Globalization/CharUnicodeInfo.xml

@@ -666,9 +666,9 @@
         <Parameter Name="codePoint" Type="System.Int32" Index="0" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="codePoint">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="codePoint">A number representing the 32-bit code point value of the Unicode character.</param>
+        <summary>Gets the Unicode category of the specified character.</summary>
+        <returns>A <see cref="T:System.Globalization.UnicodeCategory" /> value indicating the category of the specified character.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>