Merge branch 'improve-help-string' into 'review-argument-parsing'

Specify expanded toolchain help for all commands.

See merge request mpsd-cs/mpsd-software-environments!8

mpsd-software-environment.py

@@ -386,15 +386,14 @@ def main():
             )
             if cmd in ["install", "reinstall", "remove"]:
                 # "install" command needs additional documentation
-                if cmd == "install":
-                    help_part2 = (
-                        "Use '--toolchains ALL' to "
-                        "install all toolchains. If '--toolchain' is not "
-                        "specified, list available toolchains for the release "
-                        "(after environment has been prepared if not done yet)."
-                    )
-                else:
-                    help_part2 = ""
+                tool_chain_help = (
+                    f"Pass a list of toolchains to command {cmd}. "
+                    "Use '--toolchains ALL' to "
+                    f"{cmd} all toolchains. If '--toolchain' is not "
+                    "specified, list available toolchains for the release "
+                    "(after environment has been prepared if not done yet)."
+                )
+
                 subp.add_argument(
                     "--toolchains",  # first option defines attribute
                     # name `args.toolchains` in `args = parser_args()`
@@ -404,7 +403,7 @@ def main():
                     dest="toolchains",
                     nargs="+",
                     default="NONE",
-                    help=f"List of toolchains to {cmd}. " + help_part2,
+                    help=tool_chain_help,
                 )
                 subp.add_argument(
                     "--enable-build-cache",