docs(coding): update supported versions (#8)

* docs(coding): update supported versions

* reword

docs/contributing/coding-guidelines.md

@@ -24,7 +24,7 @@
 
 - Test your code before committing
 
-- 
+-
 
 
 ## Coding
@@ -47,14 +47,14 @@
 
 - most development should be the result of an issue
 
-- Don't catch exceptions unless you expect to respond meaningfully. 
+- Don't catch exceptions unless you expect to respond meaningfully.
 
 - Configuration: config env vars should be high in the stack, adjacent to other configuration, and
   passed down.  Env vars should typically not change behavior deep in a call stack. In no
   circumstance should an env var override an explicit setting higher in the stack. Debugging,
   logging, and other observability tooling are exceptions to this rule.
 
-- 
+-
 
 ## Issues
 
@@ -83,7 +83,7 @@ git tags in order to ensure that released software always corresponds to a git t
 
 - main is the release branch.
 - release-specific branches, branched off of main and named as x.y, support concurrent
-  patch release off the x.y 
+  patch release off the x.y
 - dev is the development branch for integration testing.
 - feature development occurs in feature branches, branched off of dev and named for the
   corresponding issue (e.g., 42-bang-the-rocks-together).
@@ -134,6 +134,4 @@ Tagging, releasing, changelogs
 
 ## Other
 
-- We support most recent 3 Python releases; https://devguide.python.org/versions/
-    - 3.9, 3.10, 3.11 now
-    - drop 3.9 and add 3.12 when 3.12 is available
+- We support the three most recent [full Python releases](https://devguide.python.org/versions/): 3.10, 3.11, and 3.12