Reverted changes on new command lines & grammatical errors

doc/writing-puzzles.md

@@ -58,7 +58,7 @@ unique: you may not have two 5-point puzzles.
 Point values should roughly reflect how difficult a problem is to solve.
 It's not terribly important that a 200-point puzzle be ten times harder
 than a 20-point puzzle, but it is crucial that a 25-point puzzle be
-roughly as difficult as a 20-point puzzle.  Poorly-weighted puzzles have
+roughly as difficult as a 20-point puzzle.  Poorly-weighted puzzles has
 been the main reason students lose interest.
 
 Step 3: Set up your puzzle structure
@@ -70,12 +70,14 @@ Your first step will be to make a "sandwich" directory somewhere.
 
     $ mkdir sandwich
     $ cd sandwich
+    $
 
 Within your category directory, create subdirectories for each point
 value puzzle.  In the "sandwich" category we have only 5, 10, and
 100-point puzzles.
 
     $ mkdir 5 10 100
+    $
 
 Step 4: Write puzzles
 ---------------------
@@ -126,12 +128,14 @@ Let's make our 5-point sandwich question!
     $ echo "3ch01c" > 00author.txt
     $ cp /tmp/sandwich.jpg ,sandwich.jpg
     $ echo ",sandwich.jpg" >> 00manifest.txt
+    $
 
 If you wanted to provide a PDF of various sandwiches, this would be the
 time to add that too:
 
     $ cp /tmp/sandwich-types.pdf .
     $ echo "sandwich-types.pdf" >> 00manifest.txt
+    $
 
 In a real category, you might provide an executable, hard drive image,
 or some other kind of blob.
@@ -149,5 +153,6 @@ up.
 
     $ cd ../..
     $ zip -r sandwich.zip sandwich/
+    $
 
 Now mail the zip file in, and you're all done!