docs: Update path for in-app markdown help.
docs: Update path for in-app markdown help.

punchagan/zulip,punchagan/zulip,eeshangarg/zulip,hackerkid/zulip,zulip/zulip,kou/zulip,rht/zulip,kou/zulip,rht/zulip,kou/zulip,zulip/zulip,hackerkid/zulip,andersk/zulip,hackerkid/zulip,andersk/zulip,hackerkid/zulip,andersk/zulip,andersk/zulip,rht/zulip,punchagan/zulip,hackerkid/zulip,kou/zulip,andersk/zulip,punchagan/zulip,kou/zulip,eeshangarg/zulip,punchagan/zulip,zulip/zulip,punchagan/zulip,punchagan/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,hackerkid/zulip,zulip/zulip,rht/zulip,kou/zulip,hackerkid/zulip,andersk/zulip,rht/zulip,zulip/zulip,eeshangarg/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,eeshangarg/zulip,kou/zulip,andersk/zulip,rht/zulip