runtime(doc): Add a note about handling symbolic links in starting.txt

closes: #16257

Signed-off-by: h-east <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/starting.txt b/runtime/doc/starting.txt
index 7ce4d6f..94ed836 100644
--- a/runtime/doc/starting.txt
+++ b/runtime/doc/starting.txt
@@ -1,4 +1,4 @@
-*starting.txt*  For Vim version 9.1.  Last change: 2024 Oct 05
+*starting.txt*  For Vim version 9.1.  Last change: 2024 Dec 19
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -976,6 +976,7 @@
 The $MYVIMRC or $MYGVIMRC environment variable will be set to the first found
 vimrc and/or gvimrc file while $MYVIMDIR is set to the users personal runtime
 directory 'rtp' (typically the first entry in 'runtimepath').
+Note: These environment variables resolve symbolic links, but 'rtp' does not.
 
 
 Some hints on using initializations ~