Doc fix: Linux, not Linux-like

Author: tsegismont

README.adoc

@@ -37,7 +37,7 @@ The `protoc` Javascript and gRPC Web plugin files must be installed somewhere on
 
 [TIP]
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-On several Linux-like systems, you can install the plugins like this:
+On several Linux systems, you can install the plugins like this:
 
 [source,shell]
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