Fix typos

Author: hugovk

CHANGES.rst

@@ -4325,7 +4325,7 @@ Changelog (Pillow)
 - Documentation changes, URL update, transpose, release checklist
   [radarhere]
 
-- Fixed saving to nonexistant files specified by pathlib.Path objects #1748 (fixes #1747)
+- Fixed saving to nonexistent files specified by pathlib.Path objects #1748 (fixes #1747)
   [radarhere]
 
 - Round Image.crop arguments to the nearest integer #1745 (fixes #1744)
@@ -7536,7 +7536,7 @@ The test suite includes 400 individual tests.
 - A handbook is available (distributed separately).
 
 - The coordinate system is changed so that (0,0) is now located
-  in the upper left corner.  This is in compliancy with ISO 12087
+  in the upper left corner.  This is in compliance with ISO 12087
   and 90% of all other image processing and graphics libraries.
 
 - Modes "1" (bilevel) and "P" (palette) have been introduced.  Note

Tests/test_locale.py

@@ -19,7 +19,7 @@
 # 7
 # 160
 
-# one of string.whitespace is not freely convertable into ascii.
+# one of string.whitespace is not freely convertible into ascii.
 
 path = "Tests/images/hopper.jpg"
 

src/libImaging/JpegDecode.c

@@ -180,7 +180,7 @@ ImagingJpegDecode(Imaging im, ImagingCodecState state, UINT8 *buf, Py_ssize_t by
 
             /* Decoder settings */
 
-            /* jpegmode indicates whats in the file; if not set, we'll
+            /* jpegmode indicates what's in the file; if not set, we'll
                trust the decoder */
             if (strcmp(context->jpegmode, "L") == 0) {
                 context->cinfo.jpeg_color_space = JCS_GRAYSCALE;