net: fix typo in parsePort documentation

Change-Id: Ia302d9018690cd26890f874c70bd0c429a4b51f0
Reviewed-on: https://go-review.googlesource.com/78975Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/net/port.go

@@ -4,7 +4,7 @@
 
 package net
 
-// parsePort parses service as a decimal interger and returns the
+// parsePort parses service as a decimal integer and returns the
 // corresponding value as port. It is the caller's responsibility to
 // parse service as a non-decimal integer when needsLookup is true.
 //