Update docs

plugins/README.md

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 <p align="center"><img src="https://i.imgur.com/14iPDIq.png" /></p>
 <p align="center"><i>image preview with plugin thumb</i></p>
 
-Plugins extend the capabilities of `nnn`. They are scripts which `nnn` can communicate with and trigger. This mechanism fits perfectly with the fundamental design to keep the core file manager lean and fast, by delegating repetitive (but not necessarily file manager-specific) tasks to the plugins.
+Plugins extend the capabilities of `nnn`. They are _executable_ scripts (or binaries) which `nnn` can communicate with and trigger. This mechanism fits perfectly with the fundamental design to keep the core file manager lean and fast, by delegating repetitive (but not necessarily file manager-specific) tasks to the plugins.
 
 The currently available plugins are listed below.