Remove WordPress.org IP from function documentation

[dd32]

A WordPress.org IP address (which may change over time) is currently in use in some function documentation.

We might as well update that to point to a TEST-NET-xx address.

I've randomly chosen 198.51.100.50 based on a google suggestion, to differentiate from 192.xxxxx that might be thought to be local at first glance.

We could also use TEST-NET-3 if a more obviously public IP range is wanted:

TEST-NET-1: 192.0.2.0 - 192.0.2.255 (192.0.2.0/24)
TEST-NET-2: 198.51.100.0 - 198.51.100.255 (198.51.100.0/24)
TEST-NET-3: 203.0.113.0 - 203.0.113.255 (203.0.113.0/24)

PR attached.

A WordPress.org IP address (which may change over time) is currently used within a docblock, we should update this to use an IP from a TEST-NET-xx IP range.

Trac ticket: https://core.trac.wordpress.org/ticket/65229

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