Updated documentation for the framework's internals
Updated documentation for the framework's internals

* doc/src/internals.dox: Changed wording and grammar in some places, to improve
readability. Also updated some method names, according to the current API
reference documentation. When in doubt, method names where added in square
brackets.

RHawkeyed/framework,Elleo/framework,sil2100/maliit-framework,binlaten/framework,Elleo/framework,sil2100/maliit-framework,jpetersen/framework,sil2100/maliit-framework,sil2100/maliit-framework,RHawkeyed/framework,jpetersen/framework