Docs formatting df join validate (#54311)

update docs to remove bold on first list item and remove unncessary full stop.

Author: sleepypioneer

pandas/core/frame.py

@@ -10183,8 +10183,7 @@ def join(
             * left: use calling frame's index (or column if on is specified)
             * right: use `other`'s index.
             * outer: form union of calling frame's index (or column if on is
-              specified) with `other`'s index, and sort it.
-              lexicographically.
+              specified) with `other`'s index, and sort it lexicographically.
             * inner: form intersection of calling frame's index (or column if
               on is specified) with `other`'s index, preserving the order
               of the calling's one.
@@ -10204,7 +10203,7 @@ def join(
             If specified, checks if join is of specified type.
 
             * "one_to_one" or "1:1": check if join keys are unique in both left
-               and right datasets.
+              and right datasets.
             * "one_to_many" or "1:m": check if join keys are unique in left dataset.
             * "many_to_one" or "m:1": check if join keys are unique in right dataset.
             * "many_to_many" or "m:m": allowed, but does not result in checks.