NIT: Format text.rst doc code (pandas-dev#37168)

Author: dsaxton

doc/source/user_guide/text.rst

@@ -302,10 +302,10 @@ positional argument (a regex object) and return a string.
        return m.group(0)[::-1]
 
 
-   pd.Series(
-       ["foo 123", "bar baz", np.nan],
-       dtype="string"
-   ).str.replace(pat, repl, regex=True)
+   pd.Series(["foo 123", "bar baz", np.nan], dtype="string").str.replace(
+       pat, repl, regex=True
+   )
+
 
    # Using regex groups
    pat = r"(?P<one>\w+) (?P<two>\w+) (?P<three>\w+)"