fixup docs

Author: MylesBorins

doc/api/esm.md

@@ -33,8 +33,7 @@ node --experimental-modules my-app.mjs
 ### Supported
 
 Only the CLI argument for the main entry point to the program can be an entry
-point into an ESM graph. Dynamic import can also be used with the flag
-`--harmony-dynamic-import` to create entry points into ESM graphs at runtime.
+point into an ESM graph.
 
 ### Unsupported