Correcting grammar.

Author: kmvanbrunt

CHANGELOG.md

@@ -64,7 +64,7 @@ prompt is displayed.
       before calling it like the previous functions did.
     - Removed `Cmd.default_to_shell`.
     - Removed `Cmd.ruler` since `cmd2` no longer uses it.
-    - All parsers used with `cmd2` commands much be an instance of `Cmd2ArgumentParser` or a child
+    - All parsers used with `cmd2` commands must be an instance of `Cmd2ArgumentParser` or a child
       class of it.
     - Removed `set_ap_completer_type()` and `get_ap_completer_type()` since `ap_completer_type` is
       now a public member of `Cmd2ArgumentParser`.

cmd2/decorators.py

@@ -226,7 +226,7 @@ def with_argparser(
 ) -> Callable[[ArgparseCommandFunc[CmdOrSet]], RawCommandFuncOptionalBoolReturn[CmdOrSet]]:
     """Decorate a ``do_*`` method to populate its ``args`` argument with the given instance of Cmd2ArgumentParser.
 
-    :param parser: instance of Cmd2ArgumentParser or a callable that returns an Cmd2ArgumentParser for this command
+    :param parser: instance of Cmd2ArgumentParser or a callable that returns a Cmd2ArgumentParser for this command
     :param ns_provider: An optional function that accepts a cmd2.Cmd or cmd2.CommandSet object as an argument and returns an
                         argparse.Namespace. This is useful if the Namespace needs to be prepopulated with state data that
                         affects parsing.
@@ -362,7 +362,7 @@ def as_subcommand_to(
 
     :param command: Command Name. Space-delimited subcommands may optionally be specified
     :param subcommand: Subcommand name
-    :param parser: instance of Cmd2ArgumentParser or a callable that returns an Cmd2ArgumentParser for this subcommand
+    :param parser: instance of Cmd2ArgumentParser or a callable that returns a Cmd2ArgumentParser for this subcommand
     :param help: Help message for this subcommand which displays in the list of subcommands of the command we are adding to.
                  This is passed as the help argument to subparsers.add_parser().
     :param aliases: Alternative names for this subcommand. This is passed as the alias argument to

docs/migrating/next_steps.md

@@ -9,7 +9,7 @@ leveraging other `cmd2` features. The three ideas here will get you started. Bro
 For all but the simplest of commands, it's probably easier to use
 [argparse](https://docs.python.org/3/library/argparse.html) to parse user input than to do it
 manually yourself for each command. `cmd2` provides a `@with_argparser()` decorator which associates
-an `Cmd2ArgumentParser` object with one of your commands. Using this method will:
+a `Cmd2ArgumentParser` object with one of your commands. Using this method will:
 
 1.  Pass your command a
     [Namespace](https://docs.python.org/3/library/argparse.html#argparse.Namespace) containing the