Update cheatsheets

gcloud-kms-decrypt

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gcloud kms decrypt
+
+> Decrypt a ciphertext file using a Cloud KMS key.
+> See also: `gcloud`.
+> More information: <https://cloud.google.com/sdk/gcloud/reference/kms/decrypt>.
+
+- Decrypt a file using a specified key, key ring, and location:
+
+`gcloud kms decrypt --key={{key_name}} --keyring={{keyring_name}} --location={{global}} --ciphertext-file={{path/to/ciphertext}} --plaintext-file={{path/to/plaintext}}`
+
+- Decrypt a file with additional authenticated data (AAD) and write the decrypted plaintext to `stdout`:
+
+`gcloud kms decrypt --key={{key_name}} --keyring={{keyring_name}} --location={{global}} --additional-authenticated-data-file={{path/to/file.aad}} --ciphertext-file={{path/to/ciphertext}} --plaintext-file=-`