Fixed .rst indentation

This caused warnings.

.gitignore

@@ -7,5 +7,4 @@ tegra/
 .sw[a-z]
 .*.swp
 tags
-build/
 Thumbs.db

modules/optim/doc/downhill_simplex_method.rst

@@ -140,13 +140,10 @@ are supposed to be set via the setters before the call to this method or the def
 
 .. ocv:function:: double optim::DownhillSolver::minimize(InputOutputArray x)
 
-    :param x: The initial point, that will become a centroid of an initial simplex. After the algorithm will terminate, it will be setted to the
-    point where the algorithm stops, the point of possible minimum.
+    :param x: The initial point, that will become a centroid of an initial simplex. After the algorithm will terminate, it will be setted to the point where the algorithm stops, the point of possible minimum.
 
     :return: The value of a function at the point found.
 
-Explain parameters.
-
 optim::createDownhillSolver
 ------------------------------------