runtime(doc): update return types for builtin functions

Commit: 
https://github.com/vim/vim/commit/17ad852a62b6e2cf25207292ebca7a748e529d59
Author: Christian Brabandt <c...@256bit.org>
Date:   Fri May 9 00:03:20 2025 +0200

    runtime(doc): update return types for builtin functions
    
    fixes: https://github.com/vim/vim/issues/17273
    
    credit: Github user @msoyka2024
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 55a0731a8..3f52e109c 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*  For Vim version 9.1.  Last change: 2025 Apr 27
+*builtin.txt*  For Vim version 9.1.  Last change: 2025 May 08
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -194,9 +194,8 @@ filter({expr1}, {expr2})    List/Dict/Blob/String
                                        remove items from {expr1} where
                                        {expr2} is 0
 finddir({name} [, {path} [, {count}]])
-                               String  find directory {name} in {path}
 findfile({name} [, {path} [, {count}]])
-                               String  find file {name} in {path}
+                               String/List find dir/file {name} in {path}
 flatten({list} [, {maxdepth}]) List    flatten {list} up to {maxdepth} levels
 flattennew({list} [, {maxdepth}])
                                List    flatten a copy of {list}
@@ -2286,6 +2285,7 @@ cursor({list})
                Can also be used as a |method|: >
                        GetCursorPos()->cursor()
 <
+               Returns 0 when the position could be set, -1 otherwise.
                Return type: |Number|
 
 
@@ -3167,7 +3167,7 @@ feedkeys({string} [, {mode}])                             
*feedkeys()*
                Can also be used as a |method|: >
                        GetInput()->feedkeys()
 <
-               Return type: |String| or list<string> depending on {list}
+               Return type: |Number|
 
 
 filecopy({from}, {to})                                 *filecopy()*
@@ -4962,7 +4962,7 @@ getreg([{regname} [, 1 [, {list}]]])                      
*getreg()*
                Can also be used as a |method|: >
                        GetRegname()->getreg()
 <
-               Return type: |String|
+               Return type: |String| or list<string> depending on {list}
 
 
 getreginfo([{regname}])                                        *getreginfo()*
@@ -9828,6 +9828,7 @@ setcursorcharpos({list})
                Can also be used as a |method|: >
                        GetCursorPos()->setcursorcharpos()
 <
+               Returns 0 when the position could be set, -1 otherwise.
                Return type: |Number|
 
 

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