Advertise changes in release notes

Update TODO list in conf.py

Author: glatterf42

RELEASE_NOTES.rst

@@ -1,8 +1,10 @@
-.. Next release
-.. ============
+Next release
+============
 
-.. All changes
-.. -----------
+All changes
+-----------
+
+- Improve readability of LaTeX equations in docs (:pull:`721`).
 
 .. _v3.7.0:
 

doc/conf.py

@@ -138,6 +138,8 @@
 
 # -- Options for sphinx.ext.mathjax ----------------------------------------------------
 
+# See https://github.com/iiasa/message_ix/pull/721#pullrequestreview-1497907368:
+# prefer to write \text{} explicitly
 # TODO read at least some of these from message_ix.models
 # TODO complete list
 # TODO also add these to a LaTeX preamble