Installation guide
ch. http/2

There is bullet list:

• is supported for encrypted connections using Transport Layer Security (TLS) (SSLEnabled="true"), indicated by the h2 keyword when enabled.
• is not supported for unencrypted connections using the Transmission Control Protocol (TCP) indicated by the h2c keyword when enabled.

I suggest to write it like:

• is supported for encrypted connections over TLS (h2).
• is not supported for unencrypted connections over TCP (h2c).