fix typos in comments

dune/istl/multitypeblockvector.hh

@@ -185,8 +185,8 @@ namespace Dune {
   /**
      @brief Vector scalar multiplication
 
-     multiplies the the current elements of x and y and recursively
-     and sums it all up. Provides to variants:
+     multiplies the current elements of x and y and recursively
+     sums it all up. Provides to variants:
      1) 'mul'  computes the indefinite inner product and
      2) 'dot'  provides an inner product by conjugating the first argument
    */

dune/istl/novlpschwarz.hh

@@ -38,7 +38,7 @@ namespace Dune {
    * well as data parallel parallelisation approaches.
    *
    * The \ref ISTL_Solvers "solvers" can easily be turned into parallel solvers
-   * initializing them with matching parallel subclasses of the the base classes
+   * initializing them with matching parallel subclasses of the base classes
    * ScalarProduct, Preconditioner and LinearOperator.
    *
    * The information of the data distribution is provided by OwnerOverlapCopyCommunication

dune/istl/schwarz.hh

@@ -34,11 +34,11 @@ namespace Dune {
    * (implicitly) know the data distribution and communication patterns,
    * there is a clear separation of the parallel data composition together
    *  with the communication APIs from the data structures. This allows for
-   * implementing overalapping and nonoverlapping domain decompositions as
+   * implementing overlapping and nonoverlapping domain decompositions as
    * well as data parallel parallelisation aproaches.
    *
    * The \ref ISTL_Solvers "solvers" can easily be turned into parallel solvers
-   * initializing them with matching parallel subclasses of the the base classes
+   * initializing them with matching parallel subclasses of the base classes
    * ScalarProduct, Preconditioner and LinearOperator.
    *
    * The information of the data distribution is provided by OwnerOverlapCopyCommunication