Update documentation; unpin towncrier since sphinxcontrib-towncrier supports recent towncrier version

Author: ericpre

doc/api/index.rst

@@ -35,7 +35,7 @@ The **dictionary** contains the following fields:
 * ``'metadata'`` -- dictionary containing the parsed metadata
 * ``'original_metadata'`` -- dictionary containing the full metadata tree from the
   input file
-* ``'file_handle'`` -- (compatible format only) the file handle when ``lazy`` is ``True`` otherwise ``None``
+* ``'file_handle'`` -- (compatible format only: :ref:`emd <emd-format>`, :ref:`hspy <hspy-format>`, :ref:`NeXus <nexus-format>`, :ref:`tiff <tiff-format>`, :ref:`USID <usid-format>`) the file handle when ``lazy`` is ``True`` otherwise ``None``
 
 Interfacing the reader from one of the IO plugins:
 

pyproject.toml

@@ -117,8 +117,7 @@ doc = [
   "sphinx-favicon",
   "sphinxcontrib-towncrier",
   "sphinx-copybutton",
-  # unpin when sphinxcontrib-towncrier supports towncrier >=24
-  "towncrier<24",
+  "towncrier",
   "sphinx_design",
 ]
 all = [