spec: clarify type elision rules for composite literals

- organize examples better
- add an example illustrating behavior if element type is a named pointer type
- both compilers and go/types (per https://go-review.googlesource.com/33358)
  follow this now

See the issue for detailed discussion.

Fixes #17954.

Change-Id: I8d90507ff2347d9493813f75b73233819880d2b4
Reviewed-on: https://go-review.googlesource.com/33361
Reviewed-by: Rob Pike <r@golang.org>

doc/go_spec.html

@@ -1,6 +1,6 @@
 <!--{
 	"Title": "The Go Programming Language Specification",
-	"Subtitle": "Version of November 4, 2016",
+	"Subtitle": "Version of November 18, 2016",
 	"Path": "/ref/spec"
 }-->
 
@@ -2006,7 +2006,7 @@ _, y, _ := coord(p)  // coord() returns three values; only interested in y coord
 <p>
 Unlike regular variable declarations, a short variable declaration may <i>redeclare</i>
 variables provided they were originally declared earlier in the same block
-(or the parameter lists if the block is the function body) with the same type, 
+(or the parameter lists if the block is the function body) with the same type,
 and at least one of the non-<a href="#Blank_identifier">blank</a> variables is new.
 As a consequence, redeclaration can only appear in a multi-variable short declaration.
 Redeclaration does not introduce a new variable; it just assigns a new value to the original.
@@ -2352,10 +2352,11 @@ the <code>&amp;T</code> when the element or key type is <code>*T</code>.
 [][]int{{1, 2, 3}, {4, 5}}          // same as [][]int{[]int{1, 2, 3}, []int{4, 5}}
 [][]Point{{{0, 1}, {1, 2}}}         // same as [][]Point{[]Point{Point{0, 1}, Point{1, 2}}}
 map[string]Point{"orig": {0, 0}}    // same as map[string]Point{"orig": Point{0, 0}}
-
-[...]*Point{{1.5, -3.5}, {0, 0}}    // same as [...]*Point{&amp;Point{1.5, -3.5}, &amp;Point{0, 0}}
-
 map[Point]string{{0, 0}: "orig"}    // same as map[Point]string{Point{0, 0}: "orig"}
+
+type PPoint *Point
+[2]*Point{{1.5, -3.5}, {}}          // same as [2]*Point{&amp;Point{1.5, -3.5}, &amp;Point{}}
+[2]PPoint{{1.5, -3.5}, {}}          // same as [2]PPoint{PPoint(&amp;Point{1.5, -3.5}), PPoint(&amp;Point{})}
 </pre>
 
 <p>