docs: minor doc fixes (#4465)

Author: Peopl3s

docs/usage/exceptions.rst

@@ -1,7 +1,7 @@
 Exceptions and exception handling
 =================================
 
-Litestar define a base exception called :class:`LitestarException <litestar.exceptions.LitestarException>` which serves
+Litestar defines a base exception called :class:`LitestarException <litestar.exceptions.LitestarException>` which serves
 as a base class for all other exceptions, see :mod:`API Reference <litestar.exceptions>`.
 
 In general, Litestar has two scenarios for exception handling:

docs/usage/middleware/builtin-middleware.rst

@@ -158,7 +158,7 @@ list of domains to :class:`~litestar.app.Litestar`:
     You can use wildcard prefixes (``*.``) in the beginning of a domain to match any combination of subdomains. Thus,
     ``*.example.com`` will match ``www.example.com`` but also ``x.y.z.example.com`` etc. You can also simply put ``*``
     in trusted hosts, which means allow all. This is akin to turning the middleware off, so in this case it may be
-    better to not enable it in the first place. You should note that a wildcard can only be used only in the prefix of a
+    better to not enable it in the first place. You should note that a wildcard can only be used in the prefix of a
     domain name, not in the middle or end. Doing so will result in a validation exception being raised.
 
 

docs/usage/plugins/problem_details.rst

@@ -31,10 +31,10 @@ You can also convert any exception that is not a ``HTTPException`` into a proble
 by providing a mapping of the exception type to a callable that converts the exception into a
 ``ProblemDetailsException.``
 
-.. tip:: This can used to override how the ``HTTPException`` is converted into a problem details response as well.
+.. tip:: This can be used to override how the ``HTTPException`` is converted into a problem details response as well.
 
 .. literalinclude:: /examples/plugins/problem_details/convert_exceptions.py
     :language: python
     :caption: Converting custom exceptions into problem details response.
 
-.. warning:: If the ``extra`` field is a ``Mapping``, then it's merged into the problem details response, otherwise it's included in the response with the key ``extra.``
+.. warning:: If the ``extra`` field is a ``Mapping``, then it's merged into the problem details response, otherwise it's included in the response with the key ``extra``.