docker-diff: add page (#11138)

* docker-diff add page

* docker-diff: update page

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Update docker-diff.md

* docker-container-diff: add alias page

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

---------

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

pages/common/docker-container-diff.md

@@ -0,0 +1,8 @@
+# docker container diff
+
+> This command is an alias of `docker diff`.
+> More information: <https://docs.docker.com/engine/reference/commandline/diff>.
+
+- View documentation for the original command:
+
+`tldr docker diff`

pages/common/docker-diff.md

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+# docker diff
+
+> Inspect changes to files or directories on a container's filesystem.
+> More information: <https://docs.docker.com/engine/reference/commandline/diff>.
+
+- Inspect the changes to a container since it was created:
+
+`docker diff {{container}}`
+
+- Display help:
+
+`docker diff --help`