fix: minor adjustements

JOJ3-Configuration-Schema.md

@@ -108,8 +108,6 @@ share back with students.
   - `parsers [array of string]`: list of parsers to run on the result of command
   - `limit.cpu [int]`: maximum running time for the stage or step in sec 
   - `limit.mem [int]`: maximum amount of RAM allowed for stage of step in MB
-- `[[stages]] [array of table]`: individual configuration for a group of similar stages (eg. code quality stages)
-- `[[steps]] [array of table]`: individual configuration for a list of similar steps (eg. test cases for the online judge)
 
 ### Parsers
 
@@ -171,14 +169,14 @@ score = 10 # default OJ score for each test case
 parsers = ["diff", "stderr"]
 size.diff = 4
 size.stderr = 4 
-whitespace = true
+diff.ignorespaces = true
 
 case4.score = 15
 case4.limit.cpu = 30
 case4.limit.mem = 10
 
 case5.score = 25
-case5.parsers = [ ] 
+case5.parsers = [ ] # hide all output
 
 case6.score = 25
 case6.parsers = ["diff"]
@@ -194,7 +192,7 @@ limit.mem = 500 # set default mem limit (in MB) for all OJ test cases
 score = 10
 parsers = ["diff"]
 skip = ["case0.in", "case11.in"]
-whitespace = false
+diff.ignorespaces = false
 
 case4.score = 15
 case4.limit.cpu = 30
@@ -202,6 +200,7 @@ case4.limit.mem = 10
 
 case5.score = 25
 case5.parsers = [ ] 
+case5.diff.ignorespaces = false
 
 case6.score = 25
 case6.parsers = ["stderr"]