small update to headers for usage

src/finiteVolume/fields/fvPatchFields/derived/timeVaryingFlowRateInletVelocity/timeVaryingFlowRateInletVelocityFvPatchVectorField.H

@@ -36,7 +36,7 @@ Description
         flowRate        0.2;         // Volumetric/mass flow rate [m3/s or kg/s]
         value           uniform (0 0 0);  // placeholder
         fileName        "time-series";
-        timeBounding    repeat;           // (error|warn|clamp|repeat)
+        boundAction     repeat;           // (error|warn|clamp|repeat)
     }
     @endverbatim
 

src/finiteVolume/fields/fvPatchFields/derived/timeVaryingUniformFixedValue/timeVaryingUniformFixedValueFvPatchField.H

@@ -33,8 +33,8 @@ Description
     inlet
     {
         type            timeVaryingUniformFixedValue;
-        timeDataFile   "time-series";
-        timeBounding    clamp;           // (error|warn|clamp|repeat)
+        fileName        "time-series";
+        boundAction      clamp;           // (error|warn|clamp|repeat)
     }
     @endverbatim