fix up docstring by unfortunately removing it

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Author: glyph

docs/index.rst

@@ -129,6 +129,5 @@ By doing so, you will:
    :maxdepth: 2
    :caption: Contents:
 
-   index
    api/index
 

src/datetype/__init__.py

@@ -415,8 +415,7 @@ def replace(
         microsecond: int = ...,
         *,
         fold: int = ...,
-    ) -> Self:
-        "If no replacement tz is specified then we inherit"
+    ) -> Self: ...
 
     @property
     def year(self) -> int: ...