doc: updated the docs of get_phase() for the "ssl_cert" context.

Author: thibaultcha

README.markdown

@@ -6845,6 +6845,8 @@ Retrieves the current running phase name. Possible return values are
 	for the context of [init_by_lua](#init_by_lua) or [init_by_lua_file](#init_by_lua_file).
 * `init_worker`
 	for the context of [init_worker_by_lua](#init_worker_by_lua) or [init_worker_by_lua_file](#init_worker_by_lua_file).
+* `ssl_cert`
+	for the context of [ssl_certificate_by_lua_block](#ssl_certificate_by_lua_block) or [ssl_certificate_by_lua_file](#ssl_certificate_by_lua_file).
 * `set`
 	for the context of [set_by_lua](#set_by_lua) or [set_by_lua_file](#set_by_lua_file).
 * `rewrite`

doc/HttpLuaModule.wiki

@@ -5765,6 +5765,8 @@ Retrieves the current running phase name. Possible return values are
 : for the context of [[#init_by_lua|init_by_lua]] or [[#init_by_lua_file|init_by_lua_file]].
 * <code>init_worker</code>
 : for the context of [[#init_worker_by_lua|init_worker_by_lua]] or [[#init_worker_by_lua_file|init_worker_by_lua_file]].
+* <code>ssl_cert</code>
+: for the context of [[#ssl_certificate_by_lua_block|ssl_certificate_by_lua_block]] or [[#ssl_certificate_by_lua_file|ssl_certificate_by_lua_file]].
 * <code>set</code>
 : for the context of [[#set_by_lua|set_by_lua]] or [[#set_by_lua_file|set_by_lua_file]].
 * <code>rewrite</code>