all: fix typos

Change-Id: I8f9f58babea80bbdad52df2b67a083f3a381c217
GitHub-Last-Rev: 79ce945721ada79d7a329cec4234d3b7ce977a83
GitHub-Pull-Request: golang/image#8
Reviewed-on: https://go-review.googlesource.com/c/image/+/389054
Run-TryBot: Ian Lance Taylor <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Trust: Tobias Klauser <[email protected]>

 font/sfnt/gpos.go      | 2 +-
 font/sfnt/sfnt_test.go | 2 +-
 tiff/lzw/reader.go     | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/font/sfnt/gpos.go b/font/sfnt/gpos.go
index e0aafa5..5f4b765 100644
--- a/font/sfnt/gpos.go
+++ b/font/sfnt/gpos.go
@@ -437,7 +437,7 @@ func makeCachedCoverageRange(buf []byte) indexLookupFunc {
 		//	 pairs: 130=0, 131=1, 132=2, 133=3, 134=4, 135=5, 137=6
 		//   ranges: 130, 135, 0    137, 137, 6
 		// startCoverageIndex is used to calculate the index without counting
-		// the length of the preceeding ranges
+		// the length of the preceding ranges
 
 		idx := sort.Search(num, func(i int) bool {
 			return gi <= GlyphIndex(u16(ranges[i*6:]))
diff --git a/font/sfnt/sfnt_test.go b/font/sfnt/sfnt_test.go
index a8efa49..ec22060 100644
--- a/font/sfnt/sfnt_test.go
+++ b/font/sfnt/sfnt_test.go
@@ -567,7 +567,7 @@ func TestPostScriptSegments(t *testing.T) {
 	// drawn in a consistent direction. Clockwise for external paths,
 	// anti-clockwise for internal paths. (Actually PostScript requires the
 	// exact opposite, but FontForge reverses PostScript contours when it loads
-	// them so that everything is consistant internally -- and reverses them
+	// them so that everything is consistent internally -- and reverses them
 	// again when it saves them, of course)."
 	//
 	// The .notdef glyph isn't explicitly in the SFD file, but for some unknown
diff --git a/tiff/lzw/reader.go b/tiff/lzw/reader.go
index 78204ba..1930357 100644
--- a/tiff/lzw/reader.go
+++ b/tiff/lzw/reader.go
@@ -30,7 +30,7 @@ Aldus "off by one" algorithm.
 
 The Go code doesn't read (invalid) TIFF files written by old versions of
 libtiff, but the LZW algorithm in this package still differs from the one in
-Go's standard package library to accomodate this "off by one" in valid TIFFs.
+Go's standard package library to accommodate this "off by one" in valid TIFFs.
 */
 
 import (