doc: add instructions to update JSON doc when a permutation is added

    means that all the parameters will be taken into consideration)

  - Run the documentation generation script (`python doc/generateDocumentationData.py {new_tc_id}`) for the new Test 

    Case and copy the generated JSON file in the folder containing all files for the given group and subgroup 

    (`cp doc/results/{new_tc_id}.json doc/files/{group}/{sub-group}`)

    (`cp doc/results/{new_tc_id}.json doc/files/{group}/{subgroup}`)

- When a new global Keyword is created, it has to be declared in the corresponding Python files:

  - In `doc/analysis/checks.py` if it is an assertion type keyword (in `self.checks` to reference the method that pretty

    prints the operation and `self.args` to identify the position of the arguments) and the corresponding method to 

  - In `doc/analysis/requests.py` if it is an endpoint operation (in `self.op` with the list and position of parameters,

    in `self.description` to reference the method that pretty print the operation, and add the method that pretty prints

    the operation)

- When a new permutation is added in an existing Test Case, run the documentation generation script 

  (`python doc/generateDocumentationData.py {tc_id}`) for the Test Case and copy the generated JSON file in the 

  folder containing all files for the given group and subgroup (`cp doc/results/{tc_id}.json doc/files/{group}/{subgroup}`)

- When a new directory containing Test Cases is created, it has to be declared in `doc/generaterobotdata.py` along with

  its acronym