STYLE: Documentation updates

src/functionObjects/field/fieldValues/fieldValueDelta/fieldValueDelta.H

@@ -33,6 +33,7 @@ Description
     The operation is applied to all results of each fieldValue object.
     Accordingly, each object must generate the same number and type of results.
 
+Usage
     Example of function object specification:
     \verbatim
     fieldValueDelta1
@@ -52,7 +53,7 @@ Description
     }
     \endverbatim
 
-Usage
+    Where the entries comprise:
     \table
         Property     | Description             | Required    | Default value
         type         | type name: fieldValueDelta   | yes    |

src/functionObjects/field/fieldValues/surfaceFieldValue/surfaceFieldValue.H

@@ -37,6 +37,7 @@ Description
     For example, to calculate the volumetric or mass flux across a patch,
     apply the 'sum' operator to the flux field (typically \c phi)
 
+Usage
     Examples of function object specification:
     \verbatim
     movingWallPatch
@@ -74,7 +75,7 @@ Description
     }
     \endverbatim
 
-Usage
+    Where the entries comprise:
     \table
         Property     | Description             | Required    | Default value
         type         | type name: surfaceFieldValue   | yes         |

src/functionObjects/field/fieldValues/volFieldValue/volFieldValue.H

@@ -33,6 +33,7 @@ Description
     Given a list of user-specified fields and a 'volRegion', a number of
     operations can be performed, such as sums, averages and integrations.
 
+Usage
     Example of function object specification:
     \verbatim
     volFieldValue1
@@ -58,7 +59,7 @@ Description
     }
     \endverbatim
 
-Usage
+    Where the entries comprise:
     \table
         Property     | Description              | Required    | Default value
         type         | Type name: volFieldValue            | yes   |