gh*, glab*: standardize documentation (#7957)

pages/common/glab.md

@@ -1,28 +1,33 @@
 # glab
 
-> GitLab CLI tool to help working with GitLab from the command-line.
+> Work seamlessly with GitLab from the command-line.
+> Some subcommands such as `glab config` have their own usage documentation.
 > More information: <https://github.com/profclems/glab>.
 
-- Create a merge request:
+- Clone a GitLab repository locally:
 
-`glab mr create`
-
-- List merge requests:
-
-`glab mr list`
+`glab repo clone {{owner}}/{{repository}}`
 
 - Create a new issue:
 
 `glab issue create`
 
-- View and filter the current repository's open issues:
+- View and filter the open issues of the current repository:
 
 `glab issue list`
 
-- List pipelines:
+- View an issue in the default browser:
 
-`glab pipeline list`
+`glab issue view --web {{issue_number}}`
 
-- Clone a repository into a specific directory:
+- Create a merge request:
 
-`glab repo clone {{user}}/{{repository}} {{directory}}`
+`glab mr create`
+
+- View a pull request in the default web browser:
+
+`glab mr view --web {{pr_number}}`
+
+- Check out a specific pull request locally:
+
+`glab mr checkout {{pr_number}}`