fix bold (fix changelog again)

Author: hkershaw-brown

CHANGELOG.rst

@@ -22,7 +22,7 @@ individual files.
 
 The changes are now listed with the most recent at the top.
 
-** June 18 2021 :: build fixes for PGI compiler and intel compiler osx. Tag: v9.11.1 **
+**June 18 2021 :: build fixes for PGI compiler and intel compiler osx. Tag: v9.11.1**
 
 - mkmf.templates fixes for intel.osx and pgi
 - input.nml fix for obs_total_error