gitk, kitex, rclone, venv: edit pages (#12539)

* gitk, kitex, rclone, venv: remove trailing & leading whitespace
* gitk: remove placeholder

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Co-authored-by: Vitor Henrique <87824454+vitorhcl@users.noreply.github.com>

pages/common/rclone.md

@@ -17,7 +17,7 @@
 
 - Copy files changed within the past 24 hours to a remote from the local machine, asking the user to confirm each file:
 
-`rclone copy --interactive --max-age 24h {{remote_name}}:{{path/to/directory}} {{path/to/local_directory}} `
+`rclone copy --interactive --max-age 24h {{remote_name}}:{{path/to/directory}} {{path/to/local_directory}}`
 
 - Mirror a specific file or directory (Note: Unlike copy, sync removes files from the remote if it does not exist locally):