doc: fix small typo issue

Signed-off-by: Baptiste <baptiste.moreau@decathlon.com>

Author: bmoreau8

python/deltalake/query.py

@@ -48,7 +48,7 @@ def execute(self, sql: str) -> RecordBatchReader:
         ```python
         from deltalake import DeltaTable, QueryBuilder
         dt = DeltaTable("my_table")
-        data = QueryBuilder().register('test', dt).execute("select * from my_table").read_all()
+        data = QueryBuilder().register('test', dt).execute("select * from test").read_all()
         ```
         """
         return self._query_builder.execute(sql)