docs: two versionchanged:: 1.3.3 directives describe behaviour that shipped long before 1.3.3 #1933

Two directives name a release later than the one that shipped the behaviour they describe:

• pcapkit/corekit/infoclass.py:320, versionchanged:: 1.3.3: iterating an instance skips __excluded__.
• pcapkit/protocols/data/misc/raw.py:19, versionchanged:: 1.3.3: the Raw constructor takes protocol and error only.

A probe during #1911's directive audit found the first behaviour present continuously since v1.0.0b1, and the second since v0.16.2. Both are identical in v1.3.1.post28 and v1.3.3. The directives came in with #1808 (20323b042) and #1800 (c49e4e3bb). This is an inference from tag contents, so check it against git show <tag>:<path> before editing.

The fix is to date each directive to the release that first shipped the change, as ruled on #1911: a post-release change is marked with its own post-release or the next release, never the parent. If the behaviour predates any directive-worthy change, drop the directive.

Found in #1911's round-3 directive audit.