STYLE: some general spelling fixes

src/parallel/decompose/decomposition.dox

@@ -164,7 +164,7 @@ a region specification is only needed if the value differs.
 \subsection subsecMultiLevel Multi-level decomposition
 
 The #Foam::multiLevelDecomp decomposition provides a general means of
-successively decomposing with different methods. Each appplication of the
+successively decomposing with different methods. Each application of the
 decomposition is termed a level. For example,
 
 \verbatim

src/parallel/decompose/scotchDecomp/scotchDecomp.C

@@ -116,7 +116,7 @@ Foam::label Foam::scotchDecomp::decomposeSerial
 
         const label version = 0;
         str << version << nl;
-        // Numer of vertices
+        // Number of vertices
         str << xadj.size()-1 << ' ' << adjncy.size() << nl;
 
         // Numbering starts from 0