Add missing source files for commands

Signed-off-by: Jean-Noël Avila <[email protected]>

sources.txt

@@ -1,6 +1,7 @@
 blame-options.txt
 cmds-ancillaryinterrogators.txt
 cmds-ancillarymanipulators.txt
+cmds-developerinterfaces.txt
 cmds-foreignscminterface.txt
 cmds-guide.txt
 cmds-mainporcelain.txt
@@ -9,6 +10,7 @@ cmds-plumbingmanipulators.txt
 cmds-purehelpers.txt
 cmds-synchelpers.txt
 cmds-synchingrepositories.txt
+cmds-userinterfaces.txt
 config.txt
 config/merge.txt
 config/fmt-merge-msg.txt