Add stylistic convention for docs titles

Author: alejoe91

doc/development/development.rst

@@ -192,6 +192,7 @@ Miscelleaneous Stylistic Conventions
 #. Avoid using abbreviations in variable names (e.g. use :code:`recording` instead of :code:`rec`). It is especially important to avoid single letter variables.
 #. Use index as singular and indices for plural following the NumPy convention. Avoid idx or indexes. Plus, id and ids are reserved for identifiers (i.e. channel_ids)
 #. We use file_path and folder_path (instead of file_name and folder_name) for clarity.
+#. For the titles of documentation pages, only capitalize the first letter of the first word and classes or software packages. For example, "How to use a SortingAnalyzer in SpikeInterface".
 #. For creating headers to divide sections of code we use the following convention (see issue `#3019 <https://github.com/SpikeInterface/spikeinterface/issues/3019>`_):