DOC: Fixed pandas capitalization (pandas-dev#47617)

Co-authored-by: Marvin Walter <[email protected]>

Author: Marvjowa

RELEASE.md

@@ -1,6 +1,6 @@
 Release Notes
 =============
 
-The list of changes to Pandas between each release can be found
+The list of changes to pandas between each release can be found
 [here](https://pandas.pydata.org/pandas-docs/stable/whatsnew/index.html). For full
 details, see the commit logs at https://github.com/pandas-dev/pandas.