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Dog and Pony
Dunno about generally accepted, but I do something like this:
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If I just correct a simple spalling misstake in normal text, I don't bother pointing that out (unless it was pointed out to me, and an official thank you is appropriate).
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If I clarify my point, adds whole sentences or change the "spirit" of the post etc, I generally do that in an <b>Update:</b> block, or point it out from a such.
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Changes to code I almost always point out, the exception being if I catch it immideately after hitting submit, I may just correct it fast, trusting the odds that noone had the time to copy or download it yet.
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</ul>
<p>
Some people tend to write whole changelogs, some even timestamped for every change they make, including typo edits and other stuff. While I am too lazy to do that myself, I kinda like reading those. It shows that the post is alive and maintained by the owner. Oftenly I guess it is overkill, but if one has the stamina to do such, keep it up. :)
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<p>
I think pointing out edits is mostly only necessary if it would mean something to anyone reading it both before and after the edit in question. But it is also a nice tool to show how you were thinking from the start, and how that thinking might have changed - it is a part of how you write, in a way.
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<hr />
<i>You have moved into a dark place.<br />
It is pitch black. You are likely to be eaten by a grue.</i>
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