Updated Overall architecture (markdown)

Overall-architecture.md

@@ -9,10 +9,7 @@ TODO:
 ## Assignments
 Assignments are programming tasks that can be tested by a worker after a user 
 submits their solution. An assignment is described by a YAML file that contains information on how to 
-build, run and test it.
-
-### Terminology
-Following text requires knowledge of basic terminology used by ReCodEx. Please, check [separate page](Terminology).
+build, run and test it. Following text requires knowledge of basic terminology used by ReCodEx. Please, check [separate page](Terminology).
 
 ### Basics
 Job is a set/list of tasks (it is generally a set, but order of tasks have some meaning). These tasks may have dependencies (arbitrary number), which needs to be observed. When recodex-worker processes job, it creates a task graph, where tasks are vertices and dependencies are edges (A -> B means that the task A is on the dependency list of task B) and creates its linear ordering. The graph must be acyclic (otherwise linear ordering will not exist) and the recodex-worker attempts to execute maximal number of tasks possible. Tasks without dependencies can be executed directly, other tasks are executed when all their dependencies have been successfully completed.