switch_root, tailf, uuidparse, waitpid: add pages (#12108)

* switch_root, tailf, uuidparse, waitpid: add pages

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Co-authored-by: Vitor Henrique <87824454+vitorhcl@users.noreply.github.com>

pages/linux/uuidparse.md

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+# uuidparse
+
+> Parse universally unique identifiers.
+> See also: `uuidgen`.
+> More information: <https://manned.org/uuidparse.1>.
+
+- Parse the specified UUIDs, use a tabular output format:
+
+`uuidparse {{uuid1 uuid2 ...}}`
+
+- Parse UUIDs from `stdin`:
+
+`{{command}} | uuidparse`
+
+- Use the JSON output format:
+
+`uuidparse --json {{uuid1 uuid2 ...}}`
+
+- Do not print a header line:
+
+`uuidparse --noheadings {{uuid1 uuid2 ...}}`
+
+- Use the raw output format:
+
+`uuidparse --raw {{uuid1 uuid2 ...}}`
+
+- Specify which of the four output columns to print:
+
+`uuidparse --output {{UUID,VARIANT,TYPE,TIME}}`
+
+- Display help:
+
+`uuidparse -h`