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wikifmt: fix trailing _ in heading name reference

--- a/sys/src/cmd/aux/wikifmt.c

+++ b/sys/src/cmd/aux/wikifmt.c

@@ -185,7 +185,8 @@

 	output("0123456"+n, 1);

 	string("><a name=\"");

 	o = pos;

-	while(pos < e){

+	s = trimback(e);

+	while(pos < s){

 		if((*pos >= 'a' && *pos <= 'z')

 		|| (*pos >= 'A' && *pos <= 'Z')

 		|| (*pos >= '0' && *pos <= '9')

-- 

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