gh-97909: Mark up members of PyMemberDef (GH-98473)

Co-authored-by: T <tnie@tuta.io>

Author: Johnny11502

Doc/c-api/structures.rst

@@ -387,27 +387,27 @@ Accessing attributes of extension types
    Structure which describes an attribute of a type which corresponds to a C
    struct member.  Its fields are:
 
-   +------------------+---------------+-------------------------------+
-   | Field            | C Type        | Meaning                       |
-   +==================+===============+===============================+
-   | :attr:`name`     | const char \* | name of the member            |
-   +------------------+---------------+-------------------------------+
-   | :attr:`!type`    | int           | the type of the member in the |
-   |                  |               | C struct                      |
-   +------------------+---------------+-------------------------------+
-   | :attr:`offset`   | Py_ssize_t    | the offset in bytes that the  |
-   |                  |               | member is located on the      |
-   |                  |               | type's object struct          |
-   +------------------+---------------+-------------------------------+
-   | :attr:`flags`    | int           | flag bits indicating if the   |
-   |                  |               | field should be read-only or  |
-   |                  |               | writable                      |
-   +------------------+---------------+-------------------------------+
-   | :attr:`doc`      | const char \* | points to the contents of the |
-   |                  |               | docstring                     |
-   +------------------+---------------+-------------------------------+
+   .. c:member:: const char* PyMemberDef.name
+
+         Name of the member
+
+   .. c:member:: int PyMemberDef.type
+
+      The type of the member in the C struct.
+
+   .. c:member:: Py_ssize_t PyMemberDef.offset
+
+      The offset in bytes that the member is located on the type’s object struct.
+
+   .. c:member:: int PyMemberDef.flags
+
+      Flag bits indicating if the field should be read-only or writable.
+
+   .. c:member:: const char* PyMemberDef.doc
+
+      Points to the contents of the docstring.
 
-   :attr:`!type` can be one of many ``T_`` macros corresponding to various C
+   :c:member:`PyMemberDef.type` can be one of many ``T_`` macros corresponding to various C
    types.  When the member is accessed in Python, it will be converted to the
    equivalent Python type.
 
@@ -441,7 +441,7 @@ Accessing attributes of extension types
    handles use of the :keyword:`del` statement on that attribute more correctly
    than :c:macro:`T_OBJECT`.
 
-   :attr:`flags` can be ``0`` for write and read access or :c:macro:`READONLY` for
+   :c:member:`PyMemberDef.flags` can be ``0`` for write and read access or :c:macro:`READONLY` for
    read-only access.  Using :c:macro:`T_STRING` for :attr:`type` implies
    :c:macro:`READONLY`.  :c:macro:`T_STRING` data is interpreted as UTF-8.
    Only :c:macro:`T_OBJECT` and :c:macro:`T_OBJECT_EX`