PR feedback

Signed-off-by: Bernát Gábor <bgabor8@bloomberg.net>

docs/changelog/2587.doc.rst

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+Enumerate breaking changes of tox 4 in the FAQ, and also list major new improvements - by :user:`gaborbernat`.

docs/changelog/2602.doc.rst

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+Document in the FAQ that tox 4 will raise a warning when finding conflicting environment names - by :user:`gaborbernat`.

docs/faq.rst

@@ -100,8 +100,8 @@ Here is a non-exhaustive list of these.
         legacy (le)               legacy entry-point command
 
   The ``exec`` and ``depends`` are brand new features. Other subcommands are a more powerful versions of previously
-  existing single flags (e.g. ``-av`` is now succeeded by the ``list`` subcommand). All subcommand have a one or two
-  character shortcut for less typing on the CLI (e.g. ``tox run`` can be abbreviated to ``tox r``). For more details
+  existing single flags (e.g. ``-av`` is now succeeded by the ``list`` subcommand). All subcommands have a one or two
+  character shortcuts for less typing on the CLI (e.g. ``tox run`` can be abbreviated to ``tox r``). For more details
   see :ref:`cli`.
 - Startup times should be improved because now we no longer eagerly load all configurations for all environments, but
   instead these are performed lazily when needed. Side-effect of this is that if you have an invalid configuration will