[Doc EN]: Official Vue way to speak about a version and greater version (#1012)

* Review FR with officials terms

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* Update `NPM` to `npm`

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* la devient le (@flyusfly)

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* New core-concepts.md file

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* Update book.json using a copy/past from en version

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* Remove book.json

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* Add book.json

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* Add `createNamespacedHelpers` french translation

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* Change http link to https

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* September updates

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* Fix small errors

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* Review de @rspt

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* New translation for v2.5

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* API fixes

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* Re-add title

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* Official Vue way to speak about a version and more greater version

Signed-off-by: Bruno Lesieur <bruno.lesieur@gmail.com>

Author: MachinisteWeb

docs/en/SUMMARY.md

@@ -1,6 +1,6 @@
 # Vuex
 
-> Note: for TypeScript users, vuex@>= 3.0 requires vue@>=2.5, and vice versa.
+> Note: for TypeScript users, vuex@3.0+ requires vue@2.5+, and vice versa.
 
 - [Release Notes](https://github.com/vuejs/vuex/releases)
 - [Installation](installation.md)

docs/fr/SUMMARY.md

@@ -1,6 +1,6 @@
 # Vuex
 
-> Note aux utilisateurs de TypeScript : vuex@3.0+ nécessite vue@>2.5+, et inverssement.
+> Note aux utilisateurs de TypeScript : vuex@3.0+ nécessite vue@2.5+, et inverssement.
 
 - [Notes de version](https://github.com/vuejs/vuex/releases)
 - [Installation](installation.md)