fixed little typo inside documentation

docs/en/reference/dql-doctrine-query-language.rst

@@ -2,7 +2,7 @@ Doctrine Query Language
 ===========================
 
 DQL stands for Doctrine Query Language and is an Object
-Query Language derivate that is very similar to the Hibernate
+Query Language derivative that is very similar to the Hibernate
 Query Language (HQL) or the Java Persistence Query Language (JPQL).
 
 In essence, DQL provides powerful querying capabilities over your

docs/en/reference/inheritance-mapping.rst

@@ -159,7 +159,7 @@ This strategy is very efficient for querying across all types in
 the hierarchy or for specific types. No table joins are required,
 only a WHERE clause listing the type identifiers. In particular,
 relationships involving types that employ this mapping strategy are
-very performant.
+very performing.
 
 There is a general performance consideration with Single Table
 Inheritance: If the target-entity of a many-to-one or one-to-one 

docs/en/reference/native-sql.rst

@@ -63,7 +63,7 @@ This has several benefits:
 - The API is much simpler than the usual ``ResultSetMapping`` API.
 
 One downside is that the builder API does not yet support entities
-with inheritance hierachies.
+with inheritance hierarchies.
 
 .. code-block:: php