Update howtobuild.md

Fix organization of code snippets
Merge pull request #794 from amoghe/patch-1

Update howtobuild.md
fix #494, Struct identifiers must be prefixed with the package name if they are not defined in current package.
fix #801, closures result parameter unsolve bug
Merge pull request #798 from bronze1man/pr-identifiers-without-packageName

fix #494, Struct identifiers must be prefixed with the package name if hey are not defined in current package
Merge pull request #802 from bronze1man/pr-ClosuresResultParameterUnsolveBug

fix #801, closures result parameter unsolve bug