man: mention --show-documentation/-D

Follow-up for 2671849.

Author: keszybz

mkosi/initrd.py

@@ -319,8 +319,7 @@ def main() -> None:
 
     if args.show_documentation:
         with resource_path(mkosi.resources) as r:
-            show_docs("mkosi-initrd", DocFormat.all(), resources=r)
-        return
+            return show_docs("mkosi-initrd", DocFormat.all(), resources=r)
 
     modulesd = Path("/usr/lib/modules") / args.kernel_version
     if not is_valid_modulesd(modulesd):

mkosi/resources/man/mkosi-addon.1.md

@@ -43,6 +43,9 @@ the running hardware can be included if a local configuration with the option
 `--debug-sandbox`
 :   Run **mkosi-sandbox** with **strace**.
 
+`--show-documentation`, `-D`
+:   Show the man page for mkosi-initrd.
+
 `--version`
 :   Show package version.
 

mkosi/resources/man/mkosi-initrd.1.md

@@ -62,6 +62,9 @@ initrds and Unified Kernel Images for the current running system.
 `--debug-sandbox`
 :   Run **mkosi-sandbox** with **strace**.
 
+`--show-documentation`, `-D`
+:   Show the man page for mkosi-initrd.
+
 `--version`
 :   Show package version.