Update cheatsheets

tldr/docker-image-save

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# docker image save
+
+> Export Docker images to archive.
+> More information: <https://docs.docker.com/reference/cli/docker/image/save/>.
+
+- Save an image by redirecting `stdout` to a tar archive:
+
+`docker {{[save|image save]}} {{image}}:{{tag}} > {{path/to/file.tar}}`
+
+- Save an image to a tar archive:
+
+`docker {{[save|image save]}} {{[-o|--output]}} {{path/to/file.tar}} {{image}}:{{tag}}`
+
+- Save all tags of the image:
+
+`docker {{[save|image save]}} {{[-o|--output]}} {{path/to/file.tar}} {{image_name}}`
+
+- Cherry-pick particular tags of an image to save:
+
+`docker {{[save|image save]}} {{[-o|--output]}} {{path/to/file.tar}} {{image_name:tag1 image_name:tag2 ...}}`