bitbake-layers/create: Improve help message for layerid argument

'Layer ID' isn't a commonly used term in our help messages or
documentation, so clarify that this is the identifier used for the new
layer in BBFILE_COLLECTIONS.

Also clarify that the default is the basename of the layerdir argument
if a layer ID is not separately provided.

(From OE-Core rev: bb8bd71b1aba31aeb0c1d2fbcae36da26865dc57)

Signed-off-by: Paul Barker <paul@pbarker.dev>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/bblayers/create.py

@@ -83,7 +83,7 @@ class CreatePlugin(LayerPlugin):
         parser_create_layer = self.add_command(sp, 'create-layer', self.do_create_layer, parserecipes=False)
         parser_create_layer.add_argument('layerdir', help='Layer directory to create')
         parser_create_layer.add_argument('--add-layer', '-a', action='store_true', help='Add the layer to bblayers.conf after creation')
-        parser_create_layer.add_argument('--layerid', '-i', help='Layer id to use if different from layername')
+        parser_create_layer.add_argument('--layerid', '-i', help='Layer ID to use in BBFILE_COLLECTIONS, if different from the layerdir basename')
         parser_create_layer.add_argument('--priority', '-p', default=6, help='Priority of recipes in layer')
         parser_create_layer.add_argument('--example-recipe-name', '-e', dest='examplerecipe', default='example', help='Filename of the example recipe')
         parser_create_layer.add_argument('--example-recipe-version', '-v', dest='version', default='0.1', help='Version number for the example recipe')