master ae2e2b6: Improve doc string of 'operating-system-release'

[Eli Zaretskii]

branch: master
commit ae2e2b6acdf9c052b726c45507945ff0a824db91
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Improve doc string of 'operating-system-release'
    
    * src/editfns.c (syms_of_editfns) <operating-system-release>: Doc
    fix.  (Bug#39940)
---
 src/editfns.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/editfns.c b/src/editfns.c
index 3b2876f..3c2a858 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -4479,7 +4479,9 @@ functions if all the text being accessed has this 
property.  */);
               doc: /* The user's name, based upon the real uid only.  */);
 
   DEFVAR_LISP ("operating-system-release", Voperating_system_release,
-              doc: /* The operating system kernel version Emacs is running on. 
 */);
+              doc: /* The kernel version of the operating system on which 
Emacs is running.
+The value is a string.  It can also be nil if Emacs doesn't
+know how to get the kernel version on the underlying OS.  */);
 
   DEFVAR_BOOL ("binary-as-unsigned",
               binary_as_unsigned,