docs: Override macboot/nomacboot documentation

These are two sides of the same variable (domacboot) so sphinx-argparse
generated docs are a bit confusing. Override the docs for them to clear
things up.

(cherry picked from commit cdcfaf562b)
Resolves: rhbz#1761653

docs/livemedia-creator.rst

@@ -43,8 +43,18 @@ livemedia-creator cmdline arguments
 -----------------------------------
 
 .. argparse::
-   :ref: pylorax.cmdline.lmc_parser
-   :prog: livemedia-creator
+    :ref: pylorax.cmdline.lmc_parser
+    :prog: livemedia-creator
+
+    --macboot : @replace
+        Make the iso bootable on UEFI based Mac systems
+
+        Default: True
+
+    --nomacboot : @replace
+        Do not create a Mac bootable iso
+
+        Default: False
 
 
 Quickstart

docs/lorax.rst

@@ -20,8 +20,18 @@ lorax cmdline arguments
 -----------------------
 
 .. argparse::
-   :ref: pylorax.cmdline.lorax_parser
-   :prog: lorax
+    :ref: pylorax.cmdline.lorax_parser
+    :prog: lorax
+
+    --macboot : @replace
+        Make the iso bootable on UEFI based Mac systems
+
+        Default: True
+
+    --nomacboot : @replace
+        Do not create a Mac bootable iso
+
+        Default: False
 
 
 Quickstart