pw_unit_test: Fixup documentation

* Fix typos in the unit test documentation

Change-Id: I7dec4c8228a487e0dc3562abdc214d612688a635
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/44440
Reviewed-by: Keir Mierle <keir@google.com>
Reviewed-by: Armando Montanez <amontanez@google.com>
Commit-Queue: Keir Mierle <keir@google.com>

pw_unit_test/docs.rst

diff --git a/pw_unit_test/docs.rst b/pw_unit_test/docs.rst
index 5459484..ac16271 100644
--- a/pw_unit_test/docs.rst
+++ b/pw_unit_test/docs.rst
@@ -9,7 +9,7 @@
 .. _Google Test: https://github.com/google/googletest/blob/master/googletest/docs/primer.md
 
 ``pw_unit_test`` is a portable library which can run on almost any system from
-from bare metal to a full-fledged desktop OS. It does this by offloading the
+bare metal to a full-fledged desktop OS. It does this by offloading the
 responsibility of test reporting and output to the underlying system,
 communicating its results through a common interface. Unit tests can be written
 once and run under many different environments, empowering developers to write
@@ -138,7 +138,7 @@
 
 The ``pw_unit_test`` module provides a few optional libraries to simplify setup:
 
- - ``simple_printing_event_handler```: When running tests, output test results
+ - ``simple_printing_event_handler``: When running tests, output test results
    as plain text over ``pw_sys_io``.
  - ``simple_printing_main``: Implements a ``main()`` function that simply runs
    tests using the ``simple_printing_event_handler``.