perldoc: add page (#12035)

pages/common/perldoc.md

@@ -0,0 +1,20 @@
+# perldoc
+
+> Look up Perl documentation in `.pod` format.
+> More information: <https://perldoc.perl.org/perldoc>.
+
+- View documentation for a builtin [f]unction, a [v]ariable or an [a]PI:
+
+`perldoc -{{f|v|a}} {{name}}`
+
+- Search in the the question headings of Perl FAQ:
+
+`perldoc -q {{regex}}`
+
+- Send output directly to `stdout` (by default, it is send to a pager):
+
+`perldoc -T {{page|module|program|URL}}`
+
+- Specify the language code of the desired translation:
+
+`perldoc -L {{language_code}} {{page|module|program|URL}}`