Icon colors specified don't match implementation

[srambach]

The colors page gives icon status colors that don't seem correct - and aren't what is in alert even though it specifically says what the colors are. They also don't seem to match what's shown in the examples on the color page.

@mcarrano @mceledonia

[mcarrano]

This appears to be a doc issue. Will transfer to patternfly-org. Let's bring the Colors page in line with current implementation.

[srambach]

To clarify,

• the default color in the example looks incorrect
• icon colors are mislabeled
• "alert icon background" doesn't make sense
• missing the alert background colors