[Chess game]: Various fixes

concepts/ranges/about.md

@@ -45,7 +45,7 @@ You can also use negative indexes to get the substring from the end of the strin
 
 ```ruby
 "Hello World"[-5..-1] # => "World"
-"Hello World"[6..-4] # => "Wor"
+"Hello World"[6..-4] # => "Wo"
 ```
 
 ## Range methods

concepts/ranges/introduction.md

@@ -45,7 +45,7 @@ You can also use negative indexes to get the substring from the end of the strin
 
 ```ruby
 "Hello World"[-5..-1] # => "World"
-"Hello World"[6..-4] # => "Wor"
+"Hello World"[6..-4] # => "Wo"
 ```
 
 ## Range methods

exercises/concept/chess-game/.docs/instructions.md

@@ -16,13 +16,13 @@ The ranks are the rows of the board, and are numbered from 1 to 8.
 The game will also have to store the files of the board.
 The files are the columns of the board and are identified by the letters A to H.
 
-Define the `Chess::Ranks` and `Chess::Files` constants that store the range of ranks and files respectively.
+Define the `Chess::RANKS` and `Chess::FILES` constants that store the range of ranks and files respectively.
 
 ```ruby
-Chess::Ranks
+Chess::RANKS
 # => 1..8
 
-Chess::Files
+Chess::FILES
 # => 'A'..'H'
 ```
 

exercises/concept/chess-game/.docs/introduction.md

@@ -45,7 +45,7 @@ You can also use negative indexes to get the substring from the end of the strin
 
 ```ruby
 "Hello World"[-5..-1] # => "World"
-"Hello World"[6..-4] # => "Wor"
+"Hello World"[6..-4] # => "Wo"
 ```
 
 ## Range methods