patch 8.1.1952: more functions can be used as a method

Problem:    More functions can be used as a method.
Solution:   Allow more functions to be used as a method.

runtime/doc/eval.txt

@@ -1,4 +1,4 @@
-*eval.txt*	For Vim version 8.1.  Last change: 2019 Aug 28
+*eval.txt*	For Vim version 8.1.  Last change: 2019 Aug 31
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -5517,7 +5517,7 @@ gettabwinvar({tabnr}, {winnr}, {varname} [, {def}])		*gettabwinvar()*
 			gettabwinvar({tabnr}, {winnr}, '&')
 
 <		Can also be used as a |method|: >
-			GetTabnr()->gettabvar(winnr, varname)
+			GetTabnr()->gettabwinvar(winnr, varname)
 
 gettagstack([{nr}])					*gettagstack()*
 		The result is a Dict, which is the tag stack of window {nr}.
@@ -5547,6 +5547,9 @@ gettagstack([{nr}])					*gettagstack()*
 
 		See |tagstack| for more information about the tag stack.
 
+		Can also be used as a |method|: >
+			GetWinnr()->gettagstack()
+
 getwininfo([{winid}])					*getwininfo()*
 		Returns information about windows as a List with Dictionaries.
 
@@ -5581,6 +5584,9 @@ getwininfo([{winid}])					*getwininfo()*
 			winrow		topmost screen column of the window,
 					row from |win_screenpos()|
 
+		Can also be used as a |method|: >
+			GetWinnr()->getwininfo()
+
 getwinpos([{timeout}])					*getwinpos()*
 		The result is a list with two numbers, the result of
 		getwinposx() and getwinposy() combined:
@@ -5600,6 +5606,10 @@ getwinpos([{timeout}])					*getwinpos()*
 			  " Do some work here
 			endwhile
 <
+
+		Can also be used as a |method|: >
+			GetTimeout()->getwinpos()
+<
 							*getwinposx()*
 getwinposx()	The result is a Number, which is the X coordinate in pixels of
 		the left hand side of the GUI Vim window. Also works for an
@@ -5619,6 +5629,9 @@ getwinvar({winnr}, {varname} [, {def}])				*getwinvar()*
 		Examples: >
 			:let list_is_on = getwinvar(2, '&list')
 			:echo "myvar = " . getwinvar(1, 'myvar')
+
+<		Can also be used as a |method|: >
+			GetWinnr()->getwinvar(varname)
 <
 glob({expr} [, {nosuf} [, {list} [, {alllinks}]]])		*glob()*
 		Expand the file wildcards in {expr}.  See |wildcards| for the
@@ -5656,6 +5669,9 @@ glob({expr} [, {nosuf} [, {list} [, {alllinks}]]])		*glob()*
 		See |expand()| for expanding special Vim variables.  See
 		|system()| for getting the raw output of an external command.
 
+		Can also be used as a |method|: >
+			GetExpr()->glob()
+
 glob2regpat({expr})					 *glob2regpat()*
 		Convert a file pattern, as used by glob(), into a search
 		pattern.  The result can be used to match with a string that
@@ -5668,7 +5684,9 @@ glob2regpat({expr})					 *glob2regpat()*
 		Note that the result depends on the system.  On MS-Windows
 		a backslash usually means a path separator.
 
-								*globpath()*
+		Can also be used as a |method|: >
+			GetExpr()->glob2regpat()
+<								*globpath()*
 globpath({path}, {expr} [, {nosuf} [, {list} [, {alllinks}]]])
 		Perform glob() on all directories in {path} and concatenate
 		the results.  Example: >
@@ -5704,6 +5722,10 @@ globpath({path}, {expr} [, {nosuf} [, {list} [, {alllinks}]]])
 <		Upwards search and limiting the depth of "**" is not
 		supported, thus using 'path' will not always work properly.
 
+		Can also be used as a |method|, the base is passed as the
+		second argument: >
+			GetExpr()->globpath(&rtp)
+<
 							*has()*
 has({feature})	The result is a Number, which is 1 if the feature {feature} is
 		supported, zero otherwise.  The {feature} argument is a