[libpng15] Corrected recent ANNOUNCE and CHANGES entry

ANNOUNCE

@@ -82,14 +82,15 @@ Version 1.5.6beta06 [October 17, 2011]
   Turned on multiple png_read_update_info in pngvalid transform tests.
   Prevent libpng from overwriting unused bits at the end of the image when
     it is not byte aligned, while reading. Prior to libpng-1.5.6 libpng would
-    overwrite the end of the image if the row width is not an exact multiple
-    of 8 bits and the image is not interlaced.
+    overwrite the partial byte at the end of each row if the row width was not
+    an exact multiple of 8 bits and the image is not interlaced.
 
 Version 1.5.6beta07 [October 21, 2011]
   Made png_ptr->prev_row an aligned pointer into png_ptr->big_prev_row
     (Mans Rullgard).
 
 Version 1.5.6beta08 [October 21, 2011]
+  Changed misleading "Missing PLTE before cHRM" warning to "Out of place cHRM"
 
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CHANGES

@@ -3643,14 +3643,15 @@ Version 1.5.6beta06 [October 17, 2011]
   Turned on multiple png_read_update_info in pngvalid transform tests.
   Prevent libpng from overwriting unused bits at the end of the image when
     it is not byte aligned, while reading. Prior to libpng-1.5.6 libpng would
-    overwrite the end of the image if the row width is not an exact multiple
-    of 8 bits and the image is not interlaced.
+    overwrite the partial byte at the end of each row if the row width was not
+    an exact multiple of 8 bits and the image is not interlaced.
 
 Version 1.5.6beta07 [October 21, 2011]
   Made png_ptr->prev_row an aligned pointer into png_ptr->big_prev_row
     (Mans Rullgard).
 
 Version 1.5.6beta08 [October 21, 2011]
+  Changed misleading "Missing PLTE before cHRM" warning to "Out of place cHRM"
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit