DOC: fix more cookbook warnings

Modules/Applications/AppImageUtils/app/otbRescale.cxx

@@ -69,8 +69,6 @@ private:
     AddParameter(ParameterType_OutputImage, "out",  "Output Image");
     SetParameterDescription( "out" , "The rescaled image filename." );
 
-    AddRAMParameter();
-
     AddParameter(ParameterType_Float,      "outmin", "Output min value");
     AddParameter(ParameterType_Float,      "outmax", "Output max value");
     SetDefaultParameterFloat("outmin", 0.0);
@@ -81,6 +79,8 @@ private:
     MandatoryOff("outmin");
     MandatoryOff("outmax");
 
+    AddRAMParameter();
+
     // Doc example parameter settings
     SetDocExampleParameterValue("in", "QB_Toulouse_Ortho_PAN.tif");
     SetDocExampleParameterValue("out", "rescaledImage.png uchar");

Modules/Applications/AppMathParser/app/otbBandMath.cxx

@@ -109,14 +109,14 @@ private:
       "Output image which is the result of the mathematical expressions on input"
       " image list operands.");
 
-    AddRAMParameter();
-
     AddParameter( ParameterType_String, "exp", "Expression");
     SetParameterDescription(
       "exp",
       "The muParser mathematical expression to apply on input images."
     );
 
+    AddRAMParameter();
+
     // Doc example parameter settings
     SetDocExampleParameterValue(
       "il",

Modules/Applications/AppMathParserX/app/otbBandMathX.cxx

@@ -208,8 +208,6 @@ private:
     AddParameter( ParameterType_OutputImage, "out", "Output Image" );
     SetParameterDescription( "out", "Output image." );
 
-    AddRAMParameter();
-
     AddParameter( ParameterType_String, "exp", "Expressions" );
     SetParameterDescription(
       "exp",
@@ -230,6 +228,8 @@ private:
     );
     MandatoryOff( "outcontext" );
 
+    AddRAMParameter();
+
     // Doc example parameter settings
     SetDocExampleParameterValue(
       "il",