Changed the regex on the "zeroes and dashes" section

More context here: Context here: https://segment.slack.com/archives/CPTA3GE2H/p1629474371032700

Author: juliaparksegment

src/personas/identity-resolution/identity-resolution-onboarding.md

@@ -80,7 +80,7 @@ In the past, Segment has seen certain default values that cause large amounts of
 
 | Value                         | Type            |
 | ----------------------------- | --------------- |
-| Zeroes and Dashes (`^[0\-]*$) | Pattern (REGEX) |
+| Zeroes and Dashes (^[0-]*$) | Pattern (REGEX) |
 | -1                            | Exact Match     |
 | null                          | Exact Match     |
 | anonymous                     | Exact Match     |