fix(learn): Clarify sudoku solver instructions (#40604)

* Clarify sudoku solver instructions

* decrease spaces

curriculum/challenges/english/06-quality-assurance/quality-assurance-projects/sudoku-solver.md

@@ -17,11 +17,14 @@ When you are done, make sure a working demo of your project is hosted somewhere
 
 # --instructions--
 
--   All puzzle logic can go into `/controllers/sudoku-solver.js`
+- All puzzle logic can go into `/controllers/sudoku-solver.js`
--   All routing logic can go into `/routes/api.js`
+  - The `validate` function should take a given puzzle string and check it to see if it has 81 valid characters for the input.
--   See the `puzzle-strings.js` file in `/controllers` for some sample puzzles your application should solve
+  - The `check` functions should be validating against the *current* state of the board.
--   To run the challenge tests on this page, set `NODE_ENV` to `test` without quotes in the `.env` file
+  - The `solve` function should handle solving any given valid puzzle string, not just the test inputs and solutions. You are expected to write out the logic to solve this.
--   To run the tests in the console, use the command `npm run test`. To open the Repl.it console, press Ctrl+Shift+P (Cmd if on a Mac) and type "open shell"
+- All routing logic can go into `/routes/api.js`
+- See the `puzzle-strings.js` file in `/controllers` for some sample puzzles your application should solve
+- To run the challenge tests on this page, set `NODE_ENV` to `test` without quotes in the `.env` file
+- To run the tests in the console, use the command `npm run test`. To open the Repl.it console, press Ctrl+Shift+P (Cmd if on a Mac) and type "open shell"
 
 Write the following tests in `tests/1_unit-tests.js`: