runtime(doc): clarify 'fileignorecase' option setting

Commit: 
https://github.com/vim/vim/commit/224f8ca769f2f5c8c4f3293e2adf7672418ba2fe
Author: Christian Brabandt <[email protected]>
Date:   Mon Sep 22 19:36:37 2025 +0000

    runtime(doc): clarify 'fileignorecase' option setting
    
    fixes: https://github.com/vim/vim/issues/18360
    
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index e1361d34d..445e925c3 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -3791,7 +3791,13 @@ A jump table for the options with a short description 
can be found at |Q_op|.
 'fileignorecase' 'fic' boolean (default on for systems where case in file
                                 names is normally ignored)
                        global
-       When set case is ignored when using file names and directories.
+       When set, case is ignored when using file and directory names.
+
+       This option is on by default on systems where the filesystem is
+       traditionally case-insensitive (for example MS-Windows and macOS).
+       However, Vim cannot determine at runtime whether a particular
+       filesystem is case-sensitive or case-insensitive.
+
        See 'wildignorecase' for only ignoring case when doing completion.
 
                                        *'filetype'* *'ft'*

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