[Doc EN]: instance.md and components.md changes (#1467)

* New in with + symbol

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

* Review of 2.5.0 doc

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

* Review

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

* Fix syntax typo

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

* Add space between new line of documentation

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

* Add @posva review

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

* Add french str

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

* Change directeur to director

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

* Fix EN doc

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

Author: MachinisteWeb

src/v2/guide/components.md

@@ -677,8 +677,7 @@ new Vue({
 </script>
 {% endraw %}
 
-In this second example, it's important to note that the child component is still completely decoupled from what happens outside of it.
-All it does is report information about its own activity including a payload data into event emitter, just in case a parent component might care.
+In this second example, it's important to note that the child component is still completely decoupled from what happens outside of it. All it does is report information about its own activity including a payload data into event emitter, just in case a parent component might care.
 
 ### Binding Native Events to Components
 

src/v2/guide/instance.md

@@ -96,7 +96,7 @@ new Vue({
 ```html
 <div id="app">
   <p>{{ foo }}</p>
-  <!-- this will no longer update foo! -->
+  <!-- this will no longer update `foo`! -->
   <button @click="foo = 'baz'">Change it</button>
 </div>
 ```