Descriptionsync: remove old WaitGroup example
The docs look awkward - there is a paragraph
"For example:" with a plain text example,
and straight below it a real Example.
Patch Set 1 #Patch Set 2 : diff -r a45cc1950c26 https://go.googlecode.com/hg/ #Patch Set 3 : diff -r a45cc1950c26 https://go.googlecode.com/hg/ #Patch Set 4 : diff -r a461bcce05f6 https://go.googlecode.com/hg/ #MessagesTotal messages: 3
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