Documentation. Change wording and fix typos

Author: andrykonchin

README.md

@@ -652,7 +652,7 @@ u.email = '[email protected]'
 u.save
 ```
 
-Save forces persistence to the datastore: a unique ID is also assigned,
+Save forces persistence to the data store: a unique ID is also assigned,
 but it is a string and not an auto-incrementing number.
 
 ```ruby

lib/dynamoid/fields.rb

@@ -45,15 +45,15 @@ module ClassMethods
       #   end
       #
       # Its type determines how it is coerced when read in and out of the
-      # datastore. You can specify +string+, +integer+, +number+, +set+, +array+,
+      # data store. You can specify +string+, +integer+, +number+, +set+, +array+,
       # +map+, +datetime+, +date+, +serialized+, +raw+, +boolean+ and +binary+
       # or specify a class that defines a serialization strategy.
       #
       # By default field type is +string+.
       #
       # Set can store elements of the same type only (it's a limitation of
-      # DynamoDB itself). If a set should store elements only some particular
-      # type +of+ option should be specified:
+      # DynamoDB itself). If a set should store elements only of some particular
+      # type then +of+ option should be specified:
       #
       #   field :hobbies, :set, of: :string
       #

lib/dynamoid/loadable.rb

@@ -10,7 +10,7 @@ def load(attrs)
       end
     end
 
-    # Reload an object from the database -- if you suspect the object has changed in the datastore and you need those
+    # Reload an object from the database -- if you suspect the object has changed in the data store and you need those
     # changes to be reflected immediately, you would call this method. This is a consistent read.
     #
     # @return [Dynamoid::Document] the document this method was called on

lib/dynamoid/persistence.rb

@@ -12,8 +12,8 @@
 
 # encoding: utf-8
 module Dynamoid
-  #   # Persistence is responsible for dumping objects to and marshalling objects from the datastore. It tries to reserialize
-  #   # values to be of the same type as when they were passed in, based on the fields in the class.
+  # Persistence is responsible for dumping objects to and marshalling objects from the data store. It tries to reserialize
+  # values to be of the same type as when they were passed in, based on the fields in the class.
   module Persistence
     extend ActiveSupport::Concern