Clarify SC 3.3.2 phone number example wording

[venkatvemuri28]

Summary

This PR addresses issue #4913 by updating one outdated example in the SC 3.3.2 (Labels or Instructions) Understanding document.

The previous example referenced invisible labels using the title attribute for multi-part phone fields, which is misleading in this context.

This change keeps the existing example structure and intent, but replaces that wording with explicit visual-label wording for each phone-field segment.

File Changed

• understanding/20/labels-or-instructions.html

Original vs Corrected Example Snippet

Original (before)

...Visual labels for the fields (beyond the punctuation) cannot be provided
in the design, so invisible labels are provided with the "title" attribute to each
of the three fields. The value of this attribute for the three fields are, respectively,

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