patch 9.1.0020: Vim9: cannot compile all methods in a class

Problem:  Vim9: cannot compile all methods in a class
Solution: Support compiling all the methods in a class using :defcompile
          (Yegappan Lakshmanan)

closes: #13844

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/vim9class.txt b/runtime/doc/vim9class.txt
index 6e94e84..ba821c1 100644
--- a/runtime/doc/vim9class.txt
+++ b/runtime/doc/vim9class.txt
@@ -1,4 +1,4 @@
-*vim9class.txt*	For Vim version 9.1.  Last change: 2024 Jan 06
+*vim9class.txt*	For Vim version 9.1.  Last change: 2024 Jan 12
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -830,7 +830,14 @@
 "new()" then the default constructor is added, even though there are other
 constructor methods.
 
+Compiling methods in a Class ~
+							*class-compile*
+The |:defcompile| command can be used to compile all the class and object
+methods defined in a class: >
 
+	defcompile MyClass	# Compile class "MyClass"
+	defcompile		# Compile the classes in the current script
+<
 ==============================================================================
 
 7.  Type definition				*typealias* *Vim9-type* *:type*