corrections + todos

Rewritten-docs.md

@@ -639,22 +639,22 @@ that. This is different for each environment (operation system, programming
 language, etc.), so each of the environments needs to have separate
 configuration.
 
-Backend understands powerful, but quite low level description of simple
+Backend works with a powerful, but quite low level description of simple
 connected tasks written in YAML syntax. More about the syntax and general task
 overview can be found on [separate
 page](https://github.com/ReCodEx/wiki/wiki/Assignments). One of the planned
 features was user friendly configuration editor, but due to tight deadline and
 team composition it did not make it to the first release. However, writing
-configuration in the basic format will be always available and allows you to use
-the full expressive power of the system.
+configuration in the basic format will be always available and allows users to 
+use the full expressive power of the system.
 
 This section walks through creation of job configuration for _hello world_
-exercise. The goal is to compile file _source.c_ and check if it prints string
-`Hello World!` to the standard output.
+exercise. The goal is to compile file _source.c_ and check if it prints `Hello 
+World!` to the standard output.
 
 The problem can be split into several tasks:
 
-- compile _source.c_ into _helloworld_ by `/usr/bin/gcc`
+- compile _source.c_ into _helloworld_ with `/usr/bin/gcc`
 - run _helloworld_ and save standard output into _out.txt_
 - fetch predefined output (suppose it is already uploaded to fileserver) with
   hash `a0b65939670bc2c010f4d5d6a0b3e4e4590fb92b` to _reference.txt_
@@ -717,6 +717,10 @@ the program cannot be executed without being compiled first. It is important to
 mark this task with _execution_ type, so exceeded limits will be reported in
 frontend.
 
+@todo describe overriding of default (per worker) limits and that we cannot 
+relax them
+@todo state clearly that the limits on stdout, stderr and file IO are shared
+
 ```{.yml}
 - task-id: "execution_1"
   test-id: "A"