ref(metrics): Fix comment typo (#2992)

Author: szokeasaurusrex

sentry_sdk/metrics.py

@@ -284,7 +284,7 @@ def _encode_metrics(flushable_buckets):
     out = io.BytesIO()
     _write = out.write
 
-    # Note on sanetization: we intentionally sanetize in emission (serialization)
+    # Note on sanitization: we intentionally sanitize in emission (serialization)
     # and not during aggregation for performance reasons.  This means that the
     # envelope can in fact have duplicate buckets stored.  This is acceptable for
     # relay side emission and should not happen commonly.