scripts: clean up west build/flash/debug help
Just changes to the west help output; no functional changes expected.
Make option descriptions lowercase to match the argparse module's
conventions. When multiple sentences are required, move them to parser
prolog/epilog or argument group description sections.
Clarify some points that have confused multiple people.
Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
diff --git a/scripts/west_commands/build_helpers.py b/scripts/west_commands/build_helpers.py
index ca116f1..631528b 100644
--- a/scripts/west_commands/build_helpers.py
+++ b/scripts/west_commands/build_helpers.py
@@ -24,7 +24,7 @@
'''Name of the default CMake generator.'''
FIND_BUILD_DIR_DESCRIPTION = '''\
-If not given, the default build directory is {}/ unless the
+If the build directory is not given, the default is {}/ unless the
build.dir-fmt configuration variable is set. The current directory is
checked after that. If either is a Zephyr build directory, it is used.
'''.format(DEFAULT_BUILD_DIR)
