Added note to 'ports' section: Port mapping is incompatible with `net…

…work_mode: host` Took a while to figure this one out. Source: docker/compose#4799 (comment)
jgentes · Apr 13, 2018 · 9d3b61f · 9d3b61f
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@@ -1380,6 +1380,8 @@ containers in the bare-metal machine's namespace and vise-versa.
 
 Expose ports.
 
+> **Note:** Port mapping is incompatible with `network_mode: host`
+
 #### Short syntax
 
 Either specify both ports (`HOST:CONTAINER`), or just the container