Update cheatsheets

tldr/doppler

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# doppler
+
+> Manage environment variables across different environments using Doppler.
+> Some subcommands such as `doppler run` and `doppler secrets` have their own usage documentation.
+> More information: <https://docs.doppler.com/docs/cli>.
+
+- Setup Doppler CLI in the current directory:
+
+`doppler setup`
+
+- Setup Doppler project and config in current directory:
+
+`doppler setup`
+
+- Run a command with secrets injected into the environment:
+
+`doppler run --command {{command}}`
+
+- View your project list:
+
+`doppler projects`
+
+- View your secrets for current project:
+
+`doppler secrets`
+
+- Open doppler dashboard in browser:
+
+`doppler open`