Use semantic line breaks

Removed stray whitespace at end of lines.  Restored line breaks for
unchanged content.  Split lines in new content at clause and sentence
boundaries, instead of wrapping at 80 columns.

TSPL.docc/ReferenceManual/Statements.md

@@ -70,7 +70,8 @@ and a `continue` statement and is discussed in <doc:Statements#Break-Statement>
 A `for`-`in` statement allows a block of code to be executed
 once for each item in a collection (or any type)
 that conforms to the
-[`Sequence`](https://developer.apple.com/documentation/swift/sequence) protocol, or in a value parameter pack.
+[`Sequence`](https://developer.apple.com/documentation/swift/sequence) protocol,
+or in a value parameter pack.
 
 A `for`-`in` statement has the following form:
 
@@ -80,9 +81,10 @@ for <#item#> in <#expression#> {
 }
 ```
 
-If the *expression* of a `for`-`in` statement is a collection *expression*, the
-`makeIterator()` method is called on it to obtain a value of an iterator type
- --- that is, a type that conforms to the 
+If the *expression* of a `for`-`in` statement is a collection *expression*,
+the `makeIterator()` method is called on it
+to obtain a value of an iterator type --- that is,
+a type that conforms to the
 [`IteratorProtocol`](https://developer.apple.com/documentation/swift/iteratorprotocol) protocol.
 The program begins executing a loop
 by calling the `next()` method on the iterator.
@@ -93,15 +95,20 @@ and then continues execution at the beginning of the loop.
 Otherwise, the program doesn't perform assignment or execute the *statements*,
 and it's finished executing the `for`-`in` statement.
 
-The *expression* of a `for`-`in` statement may also be a pack expansion 
-*expression*. In this case, on the *i*th iteration, the type of *item* is the 
-*i*th type parameter in the type parameter pack being iterated over. The value 
-of *item* is the pattern type of *expression*, with each captured type 
-parameter pack replaced with an implicit scalar type parameter with matching
-requirements. The *expression* is evaluated once at each iteration, instead of
-`n` times eagerly, where `n` is the length of the packs captured by the 
-pattern. The program will continue executing *statements* while the total 
-length of the packs captured by the pattern isn't reached.
+The *expression* of a `for`-`in` statement
+may also be a pack expansion *expression*.
+In this case,
+on the *i*th iteration,
+the type of *item* is the *i*th type parameter
+in the type parameter pack being iterated over.
+The value of *item* is the pattern type of *expression*,
+with each captured type parameter pack replaced with
+an implicit scalar type parameter with matching requirements.
+The *expression* is evaluated once at each iteration,
+instead of `n` times eagerly,
+where `n` is the length of the packs captured by the pattern.
+The program will continue executing *statements*
+while the total length of the packs captured by the pattern isn't reached.
 
 > Grammar of a for-in statement:
 >