Update cheatsheets

docker-tag

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# docker tag
+
+> Assign tags to existing Docker images.
+> More information: <https://docs.docker.com/engine/reference/commandline/tag/>.
+
+- Assign a name and tag to a specific image ID:
+
+`docker tag {{id}} {{name}}:{{tag}}`
+
+- Assign a tag to a specific image:
+
+`docker tag {{image}}:{{current_tag}} {{image}}:{{new_tag}}`
+
+- Display help:
+
+`docker tag`