Fix miscellaneous spelling/formatting

Author: moreati

.ci/ci_lib.py

@@ -167,7 +167,7 @@ def get_output(s, *args, **kwargs):
 
 def exists_in_path(progname):
     """
-    Return True if proganme exists in $PATH.
+    Return True if progname exists in $PATH.
 
     >>> exists_in_path('echo')
     True

docs/howitworks.rst

@@ -813,7 +813,7 @@ executes under the runtime importer lock, ensuring :py:keyword:`import`
 statements executing in local threads are serialized.
 
 .. note::
-   
+
     In Python 2, :py:exc:`ImportError` is raised when :py:keyword:`import` is
     attempted while the runtime import lock is held by another thread,
     therefore imports must be serialized by only attempting them from the main