Does linkerd support WC3 Propagation headers

[jseiser]

I can see this merge request went in, linkerd/linkerd2-proxy#2179

but the docs still only indicate B3.

https://linkerd.io/2.14/tasks/distributed-tracing/#modify-the-application
https://linkerd.io/2.14/tasks/distributed-tracing/#i-dont-see-any-spans-for-the-proxies

[wmorgan]

Sorry for the long delay! I believe the answer is yes, and the docs are just a bit behind.