Update cheatsheets

tldr/npm-completion

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# npm completion
+
+> Enable or set up tab-completion for npm commands.
+> More information: <https://docs.npmjs.com/cli/commands/npm-completion>.
+
+- Enable tab-completion for the current shell session:
+
+`npm completion`
+
+- Add completion to your shell profile (Bash):
+
+`npm completion >> ~/.bashrc`
+
+- Add completion to your shell profile (Zsh):
+
+`npm completion >> ~/.zshrc`
+
+- Write completions script to a specific file:
+
+`npm completion > {{path/to/file}}`