Add TAS/IST known issue HAPRoxy HTTP/2 support

[cloudfoundry/routing-release#200]

Authored-by: Greg Cobb <[email protected]>

Author: Gerg

runtime-rn.html.md.erb

@@ -219,4 +219,8 @@ Clients that connect to apps using the Gorouter are not affected.
 
 ## <a id='known-issues'></a> Known Issues
 
-<%= vars.app_runtime_abbr %> <%= vars.v_major_version %> includes no known issues.
+<%= vars.app_runtime_abbr %> v2.12 includes the following known issue:
+
+### <a id="haproxy-http2"></a> HAProxy Does Not Support HTTP/2
+
+<%= partial "/pcf/tas/known-issues/haproxy-http2" %>

segment-rn.html.md.erb

@@ -125,4 +125,8 @@ Clients that connect to apps using the Gorouter are not affected.
 
 ## <a id='known-issues'></a> Known Issues
 
-Isolation Segment v2.12 includes no known issues.
+<%= vars.segment_runtime_full %> v2.12 includes the following known issue:
+
+### <a id="haproxy-http2"></a> HAProxy Does Not Support HTTP/2
+
+<%= partial "/pcf/tas/known-issues/haproxy-http2" %>