Update methods documentation

Author: btoron

README.md

@@ -35,13 +35,13 @@ In order to use this library you need to have access to an Oracle Field Service
 
 `updateActivity(activityId, activityData)`: Update activity details
 
-`setFileProperty(activityId, propertyId, file)`: Set file property
+`setActivityFileProperty(activityId, propertyId, file)`: Set file property
 
-`getFilePropertyMetadata(activityId, propertyId)`: Get file property metadata
+`getActivityFilePropertyMetadata(activityId, propertyId)`: Get file property metadata
 
-`getFilePropertyContent(activityId, propertyId, contentType)`: Get file property content
+`getActivityFilePropertyContent(activityId, propertyId, contentType)`: Get file property content
 
-`getFileProperty(activityId, propertyId)`: Get file property (content and metadata)
+`getActivityFileProperty(activityId, propertyId)`: Get file property (content and metadata)
 
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