Smooth out and simplify the section on blocks a bit

Author: skids

doc/Language/control.pod

@@ -23,24 +23,38 @@ also be written as:
 
 =head2 X<blocks|control flow>
 
-Like many languages, Perl6 uses C<blocks> delimited by C<{> and C<}>
-to compartmentalize code.  When a block stands alone as a statement,
-it will be entered immediately after the statement before it finishes,
-and the statements inside it will be executed.  Otherwise, a block
-simply creates a closure, which may be executed at a later time:
+Like many languages, Perl6 uses C<blocks> enclosed by C<{> and C<}> to turn
+multiple statements into a single statement.  It is ok to skip the semicolon
+between the last statement in a block and the closing C<}>.
+
+    { say "Hello"; say "World" }
+
+When a block stands alone as a statement, it will be entered immediately
+after the previous statement finishes, and the statements inside it will be
+executed.
+
+    say 1;                    # says "1"
+    { say 2; say 3 };         # says "2" then says "3"
+    say 4;                    # says "4"
+
+Unless it stands alone as a statement, a block simply creates a closure.  The
+statements inside are not executed immediately.  Closures are another topic
+and how they are used is explained
+L<elsewhere|language/functions#Blocks and Lambdas>.  For now it is just
+important to understand when blocks run and when they do not:
 
     say "We get here"; { say "then here." }; { say "not here"; 0; } or die;
 
-In the above example, after running the first statement, the first
-block stands alone as a second statement, so we run the statement inside
-it.  The second block does not stand alone as a statement, so it instantiates
-an object of type C<Block>, but does not run it.  Since any object instance
-is true, the code does not die, even though that block would evaluate to 0,
-were it to be executed.
+In the above example, after running the first statement, the first block stands
+alone as a second statement, so we run the statement inside it.  The second
+block does not stand alone as a statement, so instead, it makes an object of
+type C<Block> but does not run it.  Object instances are usually considered to
+be true, so the code does not die, even though that block would evaluate to 0,
+were it to be executed.  The example does not say what to do with the C<Block>
+object, so it just gets thrown away.
 
-Most of the flow control constructs covered below are just ways to
-tell perl6 when, how, and how many times, to enter blocks like that
-second block.
+Most of the flow control constructs covered below are just ways to tell perl6
+when, how, and how many times, to enter blocks like that second block.
 
 Before we go into those, an important side-note on syntax: If there is
 nothing (or nothing but comments) on a line after a closing curly brace where