doc: clarify information about ABI version

PR-URL: https://github.com/nodejs/node/pull/10419
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Refs: https://github.com/nodejs/node/pull/9901#discussion_r93575704

doc/api/process.md

@@ -1687,9 +1687,9 @@ added: v0.2.0
 * {Object}
 
 The `process.versions` property returns an object listing the version strings of
-Node.js and its dependencies. In addition, `process.versions.modules` indicates
-the current ABI version, which is increased whenever a C++ API changes. Node.js
-will refuse to load native modules built for an older `modules` value.
+Node.js and its dependencies. `process.versions.modules` indicates the current
+ABI version, which is increased whenever a C++ API changes. Node.js will refuse
+to load modules that were compiled against a different module ABI version.
 
 ```js
 console.log(process.versions);