fix: doc: cleanup rst and markdown formatting nits

Signed-off-by: Stephen L Arnold <sarnold@vctlabs.com>

Author: sarnold

README.rst

@@ -23,8 +23,8 @@ with your own:
 
   + ``find . -name .doorstop.yml`` and review/edit all files
 
-+ then replace all the doorstop content with your own project details
-+ create more doorstop items as needed, link specific design and test
+* then replace all the doorstop content with your own project details
+* create more doorstop items as needed, link specific design and test
   elements back to related **Shall** statements
 * change the author details in ``pyproject.toml`` *and* ``docs/source/conf.py``
 * change the package directory name under the ``src`` folder

docs/swd/SDD001.md

@@ -40,7 +40,7 @@ Simple Software Units (captured from mermaid to SVG or PNG).
   <summary>simple_dependency_graph source</summary>
   simple dependency graph showing primary software units.
 
-```mermaid
+```
   graph TB
     subgraph id1[simple Dependencies]
       subgraph id2[Python Packages]