Feat CCT-467: Add explanatory info about the source of overrides in r…

…epo-overrides

command

The requrements are to put statements containing additional info about `subscription-manager repo-override --list`
and about `subscription-manager repo-override --remove` to respective parts of man pages.

**Additional info for --list:**

> Source of the listed overrides is a union of the override specified at the system itself and all the overrides set in the environment(s) system belongs in.

**Additional info for --remove:**

> Source of the override that is attempted to be removed may be one of the environment(s) the system belongs in. It can only be removed by either: removing the override from the environment it originates from or removing the system from the environment the override
> originates from.

CARD CCT-467

man/subscription-manager.8

@@ -604,7 +604,8 @@ option
 .B --remove=NAME
 Removes a named override from the repositories specified with the
 .B --repo
-option
+option.
+Source of the override that is attempted to be removed may be one of the environment(s) the system belongs in. It can only be removed by either: removing the override from the environment it originates from or removing the system from the environment the override originates from.
 
 .TP
 .B --remove-all
@@ -616,7 +617,8 @@ option
 .B --list
 Lists all overrides from repositories specified with the
 .B --repo
-option
+option. Source of the listed overrides is a union of the override specified at the system itself and all the overrides set in the environment(s) system belongs in.
+
 
 
 .SS IDENTITY OPTIONS