chore(docs): explicitly mark lizthegrey emeritus (open-telemetry#4822)

* chore(docs): explicitly mark lizthegrey emeritus

Follow-on to open-telemetry#1745 - we didn't have an emeritus section then, but we do now as of open-telemetry#2888.

* lint

* sort in order of date

CONTRIBUTING.md

@@ -630,6 +630,7 @@ should be canceled.
 
 ### Emeritus
 
+- [Liz Fong-Jones](https://github.com/lizthegrey), Honeycomb
 - [Gustavo Silva Paiva](https://github.com/paivagustavo), LightStep
 - [Josh MacDonald](https://github.com/jmacd), LightStep