Fix some typos and improve clarity

Author: marclaporte

README.txt

@@ -1,14 +1,14 @@
-This folder contains the h5p general library. The files within this folder are not specific to any framework.
+This folder contains the general H5P library. The files within this folder are not specific to any framework.
 
-Any interaction with LMS, CMS or other frameworks is done through interfaces. Plattforms needs to implement
+Any interaction with an LMS, CMS or other frameworks is done through interfaces. Platforms need to implement
 the H5PFrameworkInterface(in h5p.classes.php) and also do the following:
 
- - Provide a form for uploading h5p packages.
- - Place the uploaded h5p packages in a temporary directory
+ - Provide a form for uploading H5P packages.
+ - Place the uploaded H5P packages in a temporary directory
  +++
 
-See existing implementations for details. For instance the Drupal h5p module located on drupal.org/project/h5p
+See existing implementations for details. For instance the Drupal H5P module located at drupal.org/project/h5p
 
-We will make available documentations and tutorials for creating platform integrations in the future
+We will make available documentation and tutorials for creating platform integrations in the future.
 
-The H5P PHP library is GPL licensed due to GPL code being used for purifying HTML provided by authors.
+The H5P PHP library is GPL licensed due to GPL code being used for purifying HTML provided by authors.