Fix spelling issues

Author: guyer

CHANGELOG.rst

@@ -19,10 +19,10 @@ Pulls
 
 - Move mailing list
   (`#747 <https://github.com/usnistgov/fipy/pull/747>`_)
-- Spherical1D (Uniform and NonUniform) meshes
+- `Spherical1D` (`Uniform` and `NonUniform`) meshes
   (`#732 <https://github.com/usnistgov/fipy/pull/732>`_)
   Thanks to `@klkuhlm <https://github.com/klkuhlm>`_.
--  fix: fix neumann bcs using constraints with convection terms
+- fix Neumann BCs using constraints with convection terms
   (`#719 <https://github.com/usnistgov/fipy/pull/719>`_)
   Thanks to `@atismer <https://github.com/atismer>`_.
 - Add vertex index inversions
@@ -32,11 +32,11 @@ Fixes
 -----
 
 - `#726 <https://github.com/usnistgov/fipy/issues/726>`_:
-  MayaviClient not compatible with Python 3
+  `MayaviClient` not compatible with Python 3
 - `#663 <https://github.com/usnistgov/fipy/issues/663>`_:
-  datamin/datamax argument ignored by viewer
+  `datamin`/`datamax` argument ignored by viewer
 - `#662 <https://github.com/usnistgov/fipy/issues/662>`_:
-  Issues Scaling Colorbar with Datamin and Datamax Args
+  Issues Scaling `Colorbar` with `Datamin` and `Datamax` `Args`
 
 --------------------------
 Version 3.4.1 - 2020-02-14