go spec: added imaginary literal to semicolon rules (was missing)
go spec: added imaginary literal to semicolon rules (was missing)

- also added links to the respective sections
- reformatted section for better (source html) readability
- added missing closing </li>'s in many places

R=r
CC=golang-dev
http://codereview.appspot.com/1220041

nightlyone/golang,tv42/old-go,bdwalton/debian-golang,tianon/debian-golang,apparentlymart/golang,gnanderson/go,pombredanne/go-deleteme,ssrl/go,bdwalton/debian-golang,tv42/old-go,tianon/debian-golang,ssrl/go,bdwalton/debian-golang,tv42/old-go,tianon/debian-golang,h8liu/golang,h8liu/golang,gnanderson/go,apparentlymart/golang,gnanderson/go,h8liu/golang,ssrl/go,nightlyone/golang,tv42/old-go,gnanderson/go,bdwalton/debian-golang,ssrl/go,pombredanne/go-deleteme,nightlyone/golang,tv42/old-go,tianon/debian-golang,pombredanne/go-deleteme,gnanderson/go,tianon/debian-golang,apparentlymart/golang,dsriram/golang,tv42/old-go,dsriram/golang,pombredanne/go-deleteme,gnanderson/go,apparentlymart/golang,h8liu/golang,h8liu/golang,ssrl/go,gnanderson/go,bdwalton/debian-golang,tianon/debian-golang,apparentlymart/golang,h8liu/golang,nightlyone/golang,pombredanne/go-deleteme,bdwalton/debian-golang,dsriram/golang,dsriram/golang,tv42/old-go,nightlyone/golang,nightlyone/golang,apparentlymart/golang,nightlyone/golang,dsriram/golang,apparentlymart/golang,pombredanne/go-deleteme,tianon/debian-golang,dsriram/golang,bdwalton/debian-golang,ssrl/go,pombredanne/go-deleteme,bdwalton/debian-golang,tianon/debian-golang,ssrl/go,dsriram/golang,h8liu/golang