Paragraph formatting.

source/Control_Flow_Statements.rst

@@ -130,9 +130,9 @@ Which enzymes cut:
 Exercise
 --------
 
-| We want to establish a restriction map of a sequence.
-| But we will do this step by step,
-| and reuse the enzymes used in the previous exercise:
+We want to establish a restriction map of a sequence.
+But we will do this step by step,
+and reuse the enzymes used in the previous exercise:
 
 * Create a function that takes a sequence and an enzyme as parameters, and returns
    the position of the first binding site.