runtime(doc): CI: remove trailing white space in documentation

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/cmdline.txt b/runtime/doc/cmdline.txt
index 6a7515a..214571f 100644
--- a/runtime/doc/cmdline.txt
+++ b/runtime/doc/cmdline.txt
@@ -650,7 +650,7 @@
     :[range]!
     a user defined command without the "-bar" argument |:command|
 
-    and the following |Vim9-script| keywords: 
+    and the following |Vim9-script| keywords:
     :abstract
     :class
     :enum