convert fix by (part of) PR #129 into candidate correction

[himorin]

for part of #188 (1st one)

This pull request updates the geolocation specification's "Request a position" algorithm in index.html to clarify when steps should be performed in parallel, specifically during the permissions check and subsequent actions. The main change is to correct the algorithm's structure to reflect the intended parallel execution, improving clarity and aligning with implementation expectations.

Algorithm correction for permissions check:

• Added an aside explaining the correction: the algorithm should only switch to "in parallel" when performing the permissions check and subsequent steps, not before.
• Removed the previous sequential steps for requesting permission and handling denied permissions, and replaced them with a parallel execution block for these actions. [1] [2]

• no spec text change, purely markup fix, using candidate correction
• text in line 674 need to be reviewed
• since fix spans over multiple li, candidate correction box are inserted at beginning of listing part
• note, original (by means of "show current") had markup error, so html source diff will list some difference

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[himorin]

ah, del/ins cannot be under ol,,, hrm.

[marcoscaceres]

Markup is still invalid tho.... we might need to do nasty things... like add <li><del><ol> in there temporarily.

[marcoscaceres]

I think we want this instead: #200

[marcoscaceres]

I think we should just go with #200 and not stress about it.