doc: correct name of rules_python in bzlmod support doc (#1317)

The project name was misspelled as "rule_python"; corrected to
"rules_python"

BZLMOD_SUPPORT.md

diff --git a/BZLMOD_SUPPORT.md b/BZLMOD_SUPPORT.md
index 15e25cf..d3d0607 100644
--- a/BZLMOD_SUPPORT.md
+++ b/BZLMOD_SUPPORT.md
@@ -1,6 +1,6 @@
 # Bzlmod support
 
-## `rule_python` `bzlmod` support
+## `rules_python` `bzlmod` support
 
 - Status: Beta
 - Full Feature Parity: No