docs/glossary: Fix typos in micropython-lib paragraph.

Author: pfalcon

docs/reference/glossary.rst

@@ -54,10 +54,10 @@ Glossary
         separate project
         `micropython-lib <https://github.com/micropython/micropython-lib>`_
         which provides implementations for many modules from CPython's
-        standard library. However, large subset of these modules required
+        standard library. However, large subset of these modules require
         POSIX-like environment (Linux, MacOS, Windows may be partially
         supported), and thus would work or make sense only with MicroPython
-        Unix port. Some subset of modules however usable for baremetal ports
+        Unix port. Some subset of modules is however usable for baremetal ports
         too.
 
         Unlike monolithic :term:`CPython` stdlib, micropython-lib modules