Add AFH support information to periodic advertising documentation

[silabsbsz]

Description

Add AFH support information to periodic advertising documentation

Related Issue

Closes #IOTPA_BT-3478

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[silabs-ankayiti]

Kindly check the feedback comments and incorporate them

[silabs-ankayiti]

Looks good, changes addressed.

[silabs-ankayiti]

Since Balint is not available, may be have to take the changes in the PR and make a new PR or something like that if cannot make the CLA on behalf of Balint. Or Could you take the latest files and just commit those. Juha Laaksonen has suggested this on behalf of Balint

[Nga Nguyen (silabs-NgaNg)]

cherry-pick commits to pr #12