Add sbyte overload when using Ldc_I4_S (#3216)

* Add sbyte overload when using Ldc_I4_S

The `ldc.i4.s` opcode accepts values in the range `[-128,127]`, but the docs only showed the overload with the `byte` parameter as supported when using this opcode. This was confusing for users (including me), since negative values can't obviously be cast to `byte`.
The `sbyte` overload works too when using this opcode.

* Update xml/System.Reflection.Emit/OpCodes.xml

Co-Authored-By: MSDN.WhiteKnight <35516665+MSDN-WhiteKnight@users.noreply.github.com>

* Update xml/System.Reflection.Emit/OpCodes.xml

Co-Authored-By: Maira Wenzel <mairaw@microsoft.com>

* Update xml/System.Reflection.Emit/OpCodes.xml

Co-Authored-By: Maira Wenzel <mairaw@microsoft.com>

* Update xml/System.Reflection.Emit/OpCodes.xml

Co-Authored-By: Maira Wenzel <mairaw@microsoft.com>

Author: Sergio0694

xml/System.Reflection.Emit/OpCodes.xml

@@ -6827,9 +6827,10 @@
 
  `ldc.i4.s` is a more efficient encoding for pushing the integers from -128 to 127 onto the evaluation stack.  
 
- The following <xref:System.Reflection.Emit.ILGenerator.Emit%2A> method overload can use the `ldc.i4.s` opcode:  
+The following <xref:System.Reflection.Emit.ILGenerator.Emit%2A> method overloads can use the `ldc.i4.s` opcode:
 
--   ILGenerator.Emit(OpCode, byte)  
+- <xref:System.Reflection.Emit.ILGenerator.Emit(System.Reflection.Emit.OpCode,System.Byte)?displayProperty=nameWithType>
+- <xref:System.Reflection.Emit.ILGenerator.Emit(System.Reflection.Emit.OpCode,System.SByte)?displayProperty=nameWithType>
 
  ]]></format>
         </remarks>