Docs: Add missing docs

neofetch

@@ -3737,6 +3737,7 @@ IMAGE BACKEND:
     --caca source               Shortcut to use 'caca' backend.
     --catimg source             Shortcut to use 'catimg' backend.
     --iterm2 source             Shortcut to use 'iterm2' backend.
+    --jp2a source               Shortcut to use 'jp2a' backend.
     --tycat source              Shortcut to use 'tycat' backend.
     --w3m source                Shortcut to use 'w3m' backend.
     --off                       Shortcut to use 'off' backend.

neofetch.1

@@ -193,6 +193,9 @@ Shortcut to use 'catimg' backend.
 \fB\-\-iterm2\fR source
 Shortcut to use 'iterm2' backend.
 .TP
+\fB\-\-jp2a\fR source
+Shortcut to use 'jp2a' backend.
+.TP
 \fB\-\-tycat\fR source
 Shortcut to use 'tycat' backend.
 .TP