Fixed grammar.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403541

dlib/test/blas_bindings/blas_bindings_dot.cpp

@@ -37,7 +37,7 @@ namespace
         ) :
             tester (
                 "test_dot", // the command line argument name for this test
-                "Run test for DOT routines.", // the command line argument description
+                "Run tests for DOT routines.", // the command line argument description
                 0                     // the number of command line arguments for this test
             )
         {}