pages/*: prefer brand name and add backticks around commands (#10422)

* pages/*: prefer brand name and add backticks around commands

---------

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/peco.md

@@ -3,14 +3,14 @@
 > Interactive filtering tool.
 > More information: <https://github.com/peco/peco>.
 
-- Start peco on all files in the specified directory:
+- Start `peco` on all files in the specified directory:
 
 `find {{path/to/directory}} -type f | peco`
 
-- Start peco for running processes:
+- Start `peco` for running processes:
 
 `ps aux | peco`
 
-- Start peco with a specified query:
+- Start `peco` with a specified query:
 
 `peco --query "{{query}}"`