unicode/bidi: fix typo in variable name

Change-Id: I327ec47714aa3611fc494d099695a8213bcc9a24
GitHub-Last-Rev: 695749b3b099bffd1c1755ef47fd6b32a8894d60
GitHub-Pull-Request: golang/text#13
Reviewed-on: https://go-review.googlesource.com/c/text/+/230198
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/unicode/bidi/core.go b/unicode/bidi/core.go
index 48d1440..50deb66 100644
--- a/unicode/bidi/core.go
+++ b/unicode/bidi/core.go
@@ -480,15 +480,15 @@
 
 	// Rule W1.
 	// Changes all NSMs.
-	preceedingCharacterType := s.sos
+	precedingCharacterType := s.sos
 	for i, t := range s.types {
 		if t == NSM {
-			s.types[i] = preceedingCharacterType
+			s.types[i] = precedingCharacterType
 		} else {
 			if t.in(LRI, RLI, FSI, PDI) {
-				preceedingCharacterType = ON
+				precedingCharacterType = ON
 			}
-			preceedingCharacterType = t
+			precedingCharacterType = t
 		}
 	}