Clarify asynchronous batch latency for newly unlocked profile achievements

[UmeshCode1]

Why:

Closes: #46115

In community/community, one of the most frequent support questions from new open-source contributors is "Why hasn't my Pull Shark / Pair Extraordinaire badge appeared after my PR was merged?" (e.g. discussions #209029, #208902).

Currently, the article outlines how achievements work and which activities qualify, but does not state that badge minting is asynchronous rather than instantaneous upon merge. This leads contributors to assume the badge system is broken or that their PR did not register. Adding this clarification sets expectations and deflects repetitive inquiry threads across GitHub Community and Support.

What's being changed:

Adds a bullet point to the [!NOTE] in content/account-and-profile/reference/profile-reference.md clarifying that achievements are evaluated and awarded by an asynchronous background process and typically take 24 to 48 hours to reflect on a user profile.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
account-and-profile/reference/profile-reference.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[subatoi]

Closing per #46115 (comment)