Incorrect value for DNS TTL examples

[gravelpot]

Issue description

At: https://github.com/pantheon-systems/documentation/blob/7d496ef6285f1e335e8fc6c06d1443bc4f1073f1/source/content/partials/dns-propagation.md?plain=1#L11

the shortest TTL example shown says: 500 (5 minutes)

This is presumably meant to say 300 (5 minutes) (60 seconds * 5 minutes = 300 seconds), or perhaps 600 (10 minutes). A TTL of 500 seconds would be 8.3 minutes, which would be unusual.

The same value is repeated a few lines lower:

Lower the TTL values as low as allowed (usually 500) several days in advance at your DNS service manager.

Suggested Resolution

• Update to a correct value in both places, as appropriate.

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