STYLE: option consistency for acousticDampingSource

- accept origin or centre, as per other geometric entities

src/fvOptions/sources/derived/acousticDampingSource/acousticDampingSource.C

@@ -189,7 +189,7 @@ bool Foam::fv::acousticDampingSource::read(const dictionary& dict)
 
         coeffs_.readEntry("frequency", frequency_.value());
         coeffs_.readEntry("URef", URefName_);
-        coeffs_.readEntry("centre", x0_);
+        coeffs_.readCompat<vector>("origin", {{"centre", -1806}}, x0_);
         coeffs_.readEntry("radius1", r1_);
         coeffs_.readEntry("radius2", r2_);
 

src/fvOptions/sources/derived/acousticDampingSource/acousticDampingSource.H

@@ -36,6 +36,14 @@ Description
     \verbatim
     acousticDampingSourceCoeffs
     {
+        timeStart        0.004;
+        duration         1000.0;
+        selectionMode    all;
+        origin           (-1.25 0 0);
+        radius1          1.2;
+        radius2          1.65;
+        frequency        3000;
+        URef             UMean;
     }
     \endverbatim