DOC: Clean whatsnew and dep warning (pandas-dev#50752)

Author: phofl

doc/source/whatsnew/v2.0.0.rst

@@ -572,7 +572,7 @@ Other API changes
 Deprecations
 ~~~~~~~~~~~~
 - Deprecated argument ``infer_datetime_format`` in :func:`to_datetime` and :func:`read_csv`, as a strict version of it is now the default (:issue:`48621`)
-- Deprecated :func:`pandas.io.sql.execute`(:issue:`50185`)
+- Deprecated :func:`pandas.io.sql.execute` (:issue:`50185`)
 - :meth:`Index.is_boolean` has been deprecated. Use :func:`pandas.api.types.is_bool_dtype` instead (:issue:`50042`)
 - :meth:`Index.is_integer` has been deprecated. Use :func:`pandas.api.types.is_integer_dtype` instead (:issue:`50042`)
 - :meth:`Index.is_floating` has been deprecated. Use :func:`pandas.api.types.is_float_dtype` instead (:issue:`50042`)

pandas/core/indexes/base.py

@@ -2225,7 +2225,7 @@ def is_boolean(self) -> bool:
         """
         warnings.warn(
             f"{type(self).__name__}.is_boolean is deprecated. "
-            "Use pandas.api.types.is_bool_type instead",
+            "Use pandas.api.types.is_bool_type instead.",
             FutureWarning,
             stacklevel=find_stack_level(),
         )
@@ -2320,8 +2320,8 @@ def is_floating(self) -> bool:
         False
         """
         warnings.warn(
-            f"{type(self).__name__}.is_floating is deprecated."
-            "Use pandas.api.types.is_float_dtype instead",
+            f"{type(self).__name__}.is_floating is deprecated. "
+            "Use pandas.api.types.is_float_dtype instead.",
             FutureWarning,
             stacklevel=find_stack_level(),
         )