Update enum.rst

- Correct typos.
- Make comments more precise.

Author: Havmaagen

Doc/library/enum.rst

@@ -240,7 +240,7 @@ Data types
 
    .. method:: EnumType.__len__(cls)
 
-      Returns the number of member in *cls*::
+      Returns the number of members in *cls*::
 
         >>> len(Color)
         3
@@ -502,7 +502,7 @@ Data types
       Using :class:`auto` with :class:`Enum` results in integers of increasing value,
       starting with ``1``.
 
-   .. versionchanged:: 3.12 Added :ref:`enum-dataclass-support`
+   .. versionchanged:: 3.12 Added :ref:`enum-dataclass-support`.
 
    .. method:: Enum._add_alias_
 
@@ -977,9 +977,9 @@ Utilities and decorators
 
    *auto* can be used in place of a value.  If used, the *Enum* machinery will
    call an :class:`Enum`'s :meth:`~Enum._generate_next_value_` to get an appropriate value.
-   For :class:`Enum` and :class:`IntEnum` that appropriate value will be the last value plus
-   one; for :class:`Flag` and :class:`IntFlag` it will be the first power-of-two greater
-   than the highest value; for :class:`StrEnum` it will be the lower-cased version of
+   For :class:`Enum` and :class:`IntEnum` that appropriate value will be the highest value seen
+   plus one; for :class:`Flag` and :class:`IntFlag` it will be the first power-of-two greater
+   than the highest value seen; for :class:`StrEnum` it will be the lower-cased version of
    the member's name.  Care must be taken if mixing *auto()* with manually
    specified values.
 
@@ -989,8 +989,8 @@ Utilities and decorators
    * ``FIRST = auto()`` will work (auto() is replaced with ``1``);
    * ``SECOND = auto(), -2`` will work (auto is replaced with ``2``, so ``2, -2`` is
      used to create the ``SECOND`` enum member;
-   * ``THREE = [auto(), -3]`` will *not* work (``[<auto instance>, -3]`` is used to
-     create the ``THREE`` enum member)
+   * ``THIRD = [auto(), -3]`` will *not* work (``[<auto instance>, -3]`` is used to
+     create the ``THIRD`` enum member)
 
    .. versionchanged:: 3.11.1
 
@@ -1000,7 +1000,7 @@ Utilities and decorators
    ``_generate_next_value_`` can be overridden to customize the values used by
    *auto*.
 
-   .. note:: in 3.13 the default ``_generate_next_value_`` will always return
+   .. note:: In version 3.13 the default ``_generate_next_value_`` will always return
              the highest member value incremented by 1, and will fail if any
              member is an incompatible type.
 
@@ -1010,7 +1010,7 @@ Utilities and decorators
    enumerations.  It allows member attributes to have the same names as members
    themselves.
 
-   .. note:: the *property* and the member must be defined in separate classes;
+   .. note:: The *property* and the member must be defined in separate classes;
              for example, the *value* and *name* attributes are defined in the
              *Enum* class, and *Enum* subclasses can define members with the
              names ``value`` and ``name``.