Update cheatsheets

gh-completion

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gh completion
+
+> Generate shell completion scripts for GitHub CLI commands.
+> More information: <https://cli.github.com/manual/gh_completion>.
+
+- Print a completion script:
+
+`gh completion --shell {{bash|zsh|fish|powershell}}`
+
+- Append the `gh` completion script to `~/.bashrc`:
+
+`gh completion --shell {{bash}} >> {{~/.bashrc}}`
+
+- Append the `gh` completion script to `~/.zshrc`:
+
+`gh completion --shell {{zsh}} >> {{~/.zshrc}}`
+
+- Display the subcommand help:
+
+`gh completion`