@aturon feedback on if

https://github.com/rust-lang/book/issues/9#issuecomment-167879371

src/SUMMARY.md

@@ -13,7 +13,7 @@
     - [Scalar Types](scalar-types.md)
     - [Compound Types](compound-types.md)
     - [Comments](comments.md)
-    - [`if`](if.md)
+    - [Control flow with `if`](if.md)
     - [Loops](loops.md)
 
 - [Ownership & borrowing](ownership-and-borrowing.md)

src/if.md

@@ -1,4 +1,4 @@
-# if
+# Control flow with `if`
 
 > Two roads diverged in a yellow wood,
 > And sorry I could not travel both
@@ -8,13 +8,6 @@
 > 
 > - Robert Frost, “The Road Not Taken”
 
-One of the most primitive operations in computer programming is the ability to
-‘branch’ between two different code paths. A program can look at a value, and
-then decide: should I follow this path, or should I take the other? There’s
-actually two different metaphors here: a tree, whose branches come from the
-same, single trunk. And a road, which splits off into two, each going in a
-different direction.
-
 In Rust, there are a few ways to cause our code to branch. The most fundamental
 way is by using `if`. An `if` expression gives us two paths forward, and asks
 the question, “Which one should I take?”
@@ -218,7 +211,4 @@ error: aborting due to previous error
 Could not compile `branches`.
 ```
 
-`if` and `else` have incompatible types. This can’t work. This also
+`if` and `else` have incompatible types. This can’t work.
-means that you almost certainly need an `else` when using `if` in
-this way. If you don’t, what would the value be if the condition was
-false?