doc: Use "changesets" not "csets" in statistics pages

To make things more human readable, say "changesets from" rather than
"csets from" in all our historical pages here. Moving forward this has
been changed in our gitdm with b034e399e31a ("gitdm: fix typo csets").

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/doc/develop/statistics/u-boot-stats-v2022.10.rst b/doc/develop/statistics/u-boot-stats-v2022.10.rst
index 0693d68..6fb71d4 100644
--- a/doc/develop/statistics/u-boot-stats-v2022.10.rst
+++ b/doc/develop/statistics/u-boot-stats-v2022.10.rst
@@ -3,7 +3,7 @@
 Release Statistics for U-Boot v2022.10
 ======================================
 
-* Processed 1521 csets from 151 developers
+* Processed 1521 changesets from 151 developers
 
 * 25 employers found