If you want to be able to accurately measure and document a change in oil level, you need to do the oil measuring proceedure as shown in the manual.
Just removing your fork from the bike and then adding or removing say 5mm of oil level won't actually result in a 5mm change in oil level once the fork is put back into service - you need to completely flood the fork with oil and then remove as much as required to achieve your desired oil level.
This makes it consistant and accurate over and over.
This is what the CAUTION bold text is referring to in the pic you posted from the manual.
If you really don't care to document or know exactly how much oil is added or subtracted (bad move if you're trying to be accurate), then you can simply add or subtract some oil without going through the proceedure.
The fork has to have the spring, spring guide, and the push rod that goes through the middle of the damper rod removed (as shown in the illustration).
Compress the fork untill it bottoms out.
Push the damper rod in all the way.
Pour in as much oil as it will hold, all the way to the tippity-top.
Stroke the damper rod through it's travel 10 times.
Add more oil if the level went down.
Stroke the outer tube up and down a few inches 10 times.
Add more oil if the level went down.
Stroke the damper rod a few more times.
What you're doing is purging any air out so you will get an oil level measurement that's not going to be ruined by air bubbles taking up space and giving a false oil level reading.
Add more oil if the level went down.
Once the damper rod stroking gives a nice, firm feel through it's entire travel, make sure the fork is fully compressed, the damper rod is fully compressed, the fork is completely full of oil, and then you can set your oil level.
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