Polish changelog and readme

Author: mpalourdio

CHANGELOG.md

@@ -21,7 +21,7 @@ Min. duration time: 300ms
 req starts  spinner shows    req ends     spinner hides
 ```
 
-``SpinnerVisibilityService#visibilityObservable`` and ``PendingInterceptorService#pendingRequestsStatus`` have been deprecated in favor of ``SpinnerVisibilityService#visibilityObservable$`` and ``PendingInterceptorService#pendingRequestsStatus$`` (note the **$** at the end).
+``SpinnerVisibilityService#visibilityObservable`` and ``PendingInterceptorService#pendingRequestsStatus`` have been respectively deprecated in favor of ``visibilityObservable$`` and ``pendingRequestsStatus$`` (note the **$**).
 
 ## v2.0.0
 

README.md

@@ -79,7 +79,7 @@ In your app.component.html, simply add :
 
 ## Customizing the spinner
 
-You can customize the **background-color**, the **spinner type**, the **debounce delay** (ie. after how many milliseconds the spinner will be displayed, if needed), the **minimum duration** (ie. how many milliseconds should the spinner be displayed at least):
+You can customize the **background-color**, the **spinner type**, the **debounce delay** (ie. after how many milliseconds the spinner will be visible, if needed), the **minimum duration** (ie. how many milliseconds should the spinner be visible at least):
 ```xml
 <spinner 
     [backgroundColor]="'#ff0000'"