Docs: normalise sqlite3 placeholder how-to heading (GH-96413)

(cherry picked from commit 7b01ce79)

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>

Doc/library/sqlite3.rst

@@ -1615,8 +1615,8 @@ How-to guides
 
 .. _sqlite3-placeholders:
 
-Using placeholders to bind values in SQL queries
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+How to use placeholders to bind values in SQL queries
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 SQL operations usually need to use values from Python variables. However,
 beware of using Python's string operations to assemble queries, as they