runtime(doc): fix return value in 'exists' and 'exists_compiled()'

Commit: 
https://github.com/vim/vim/commit/911ecdcd0e80aa717b871ad94cc19f722014e44b
Author: Mao-Yining <[email protected]>
Date:   Sat Dec 6 10:33:45 2025 +0100

    runtime(doc): fix return value in 'exists' and 'exists_compiled()'
    
    closes: https://github.com/vim/vim/issues/18867
    
    Signed-off-by: Mao-Yining <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index a6a7d8663..1190300cc 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 Dec 02
+*builtin.txt*  For Vim version 9.1.  Last change: 2025 Dec 06
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -2891,7 +2891,7 @@ exists({expr})                                            
*exists()*
                Can also be used as a |method|: >
                        Varname()->exists()
 <
-               Return type: |String|
+               Return type: |Number|
 
 
 exists_compiled({expr})                                        
*exists_compiled()*
@@ -2908,7 +2908,7 @@ exists_compiled({expr})                                   
*exists_compiled()*
                Can only be used in a |:def| function. *E1233*
                This does not work to check for arguments or local variables.
 
-               Return type: |String|
+               Return type: |Number|
 
 
 exp({expr})                                            *exp()*

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