doc/_ext: Remove unnecessary f-string formatting

Replace f-string with plain string when no variable interpolation is needed.

The f-string "<empty-string>" contains no placeholders or variables, making
the f-prefix unnecessary. Using a plain string is more appropriate and
slightly more efficient.

Signed-off-by: Kefu Chai <tchaikov@gmail.com>

diff --git a/doc/_ext/ceph_confval.py b/doc/_ext/ceph_confval.py
index f515732bcbb610c38d8c15d6fc5d1c1a8e660a80..b997224ce4ebdc381098990a89b9523e2996715a 100644 (file)
--- a/doc/_ext/ceph_confval.py
+++ b/doc/_ext/ceph_confval.py
@@ -163,7 +163,7 @@ def literal(name) -> str:
     if name:
         return f'``{name}``'
     else:
-        return f'<empty string>'
+        return '<empty string>'
 
 
 def ref_confval(name) -> str: