Remove 'you' from man pages

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

docs/source/markdown/podman-container-diff.1.md.in

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+% podman-container-diff 1
+
+## NAME
+podman\-container\-diff - Inspect changes on a container's filesystem
+
+## SYNOPSIS
+**podman container diff** [*options*] *container* [*container*]
+
+## DESCRIPTION
+Displays changes on a container's filesystem. The container will be compared to its parent layer or the second argument when given.
+
+The output is prefixed with the following symbols:
+
+| Symbol | Description |
+|--------|-------------|
+| A | A file or directory was added.   |
+| D | A file or directory was deleted. |
+| C | A file or directory was changed. |
+
+## OPTIONS
+
+#### **--format**
+
+Alter the output into a different format. The only valid format for **podman container diff** is `json`.
+
+@@option latest
+
+## EXAMPLE
+
+```
+# podman container diff container1
+C /usr
+C /usr/local
+C /usr/local/bin
+A /usr/local/bin/docker-entrypoint.sh
+```
+
+```
+$ podman container diff --format json container1 container2
+{
+     "added": [
+          "/test"
+     ]
+}
+```
+
+## SEE ALSO
+**[podman(1)](podman.1.md)**, **[podman-container(1)](podman-container.1.md)**
+
+## HISTORY
+July 2021, Originally compiled by Paul Holzinger <pholzing@redhat.com>