fix(userguide): proofread and correct

related to #CAM-2260, CAM-2261, CAM-2262, CAM-2263, CAM-2264

Conflicts:
	site/src/documents/guides/user-guide/chapters/02-process-applications/01-overview.html.md
	site/src/documents/guides/user-guide/chapters/03-runtime-container-integration/03-the-camunda-jboss-as-7-subsystem.html.md