docs(samples): included snippet for unmute finding

[Sita04]

Added snippet for unmuting individual findings.

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• samples/snippets/snippets_mute_config.py:179, tag securitycenter_set_mute
• samples/snippets/snippets_mute_config.py:208, tag securitycenter_set_unmute

You are about to delete 1 region tag.

• samples/snippets/snippets_mute_config.py:179, tag securitycenter_set_mute_unmute

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