STYLE: fixup some dictionary headers

applications/test/Hashing/hashingTests

applications/test/dictionary/testDictRegex

applications/test/regex/testRegexps

applications/test/router/routerDict

applications/test/spline/test-splines

applications/test/wordRe/testRegexps

...utilities/mesh/advanced/autoRefineMesh/autoRefineMeshDict

...cations/utilities/mesh/advanced/modifyMesh/modifyMeshDict

...tions/utilities/mesh/advanced/selectCells/selectCellsDict

...s/utilities/mesh/generation/extrudeMesh/extrudeProperties

...utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict

...s/utilities/mesh/manipulation/createPatch/createPatchDict

...ons/utilities/mesh/manipulation/mirrorMesh/mirrorMeshDict

...ons/utilities/mesh/manipulation/refineMesh/refineMeshDict

applications/utilities/mesh/manipulation/topoSet/topoSetDict

...tilities/parallelProcessing/decomposePar/decomposeParDict

...sing/dataConversion/foamDataToFluent/foamDataToFluentDict

...ns/utilities/postProcessing/miscellaneous/pdfPlot/pdfDict

.../postProcessing/miscellaneous/postChannel/postChannelDict

...ilities/postProcessing/sampling/probeLocations/probesDict