Update String.Remove(int) documentation.

Closes #11301.

Author: rzikm

xml/System/String.xml

@@ -11592,7 +11592,7 @@ The following example demonstrates the <xref:System.String.PadRight%2A> method.
           <format type="text/markdown"><![CDATA[
 
 ## Remarks
-In the .NET Framework, strings are zero-based. The value of the `startIndex` parameter can range from zero to one less than the length of the string instance.
+In the .NET Framework, strings are zero-based. The value of the `startIndex` parameter can range from zero to the length of the string instance.
 
 > [!NOTE]
 > This method does not modify the value of the current instance. Instead, it returns a new string in which all characters from position `startIndex` to the end of the original string have been removed.
@@ -11612,7 +11612,7 @@ The following example demonstrates the <xref:System.String.Remove%2A> method. Th
 
 -or-
 
-<paramref name="startIndex" /> specifies a position that is not within this string.</exception>
+<paramref name="startIndex" /> is greater than the length of this instance.</exception>
         <altmember cref="T:System.Int32" />
         <altmember cref="M:System.String.Concat(System.Object)" />
         <altmember cref="M:System.String.Insert(System.Int32,System.String)" />