lckdo, mispipe, pee, vidir, vipe, zrun: add pages; flock: edit page (#12113)

* lckdo, mispipe, pee, vidir, vipe, zrun: add pages

* Apply suggestions from code review

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

* fix errors

* flock: move page

---------

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

pages/common/pee.md

@@ -0,0 +1,17 @@
+# pee
+
+> Tee `stdin` to pipes.
+> See also: `tee`.
+> More information: <https://joeyh.name/code/moreutils/>.
+
+- Run each command, providing each one with a distinct copy of `stdin`:
+
+`pee {{command1 command2 ...}}`
+
+- Write a copy of `stdin` to `stdout` (like `tee`):
+
+`pee cat {{command1 command2 ...}}`
+
+- Immediately terminate upon SIGPIPEs and write errors:
+
+`pee --no-ignore-sigpipe --no-ignore-write-errors {{command1 command2 ...}}`