Fix modules/ typos

Found using `codespell -q 3 -S ./3rdparty -L activ,amin,ang,atleast,childs,dof,endwhile,halfs,hist,iff,nd,od,uint`

backporting of commit: ec43292e1e

modules/imgcodecs/src/grfmt_jpeg.cpp

@@ -52,7 +52,7 @@
 #include <stdio.h>
 #include <setjmp.h>
 
-// the following defines are a hack to avoid multiple problems with frame ponter handling and setjmp
+// the following defines are a hack to avoid multiple problems with frame pointer handling and setjmp
 // see http://gcc.gnu.org/ml/gcc/2011-10/msg00324.html for some details
 #define mingw_getsp(...) 0
 #define __builtin_frame_address(...) 0

modules/imgcodecs/src/grfmt_pam.cpp

@@ -62,7 +62,7 @@ namespace cv {
 #define MAX_PAM_HEADER_IDENITFIER_LENGTH 8
 #define MAX_PAM_HEADER_VALUE_LENGTH 255
 
-/* PAM header fileds */
+/* PAM header fields */
 typedef enum {
     PAM_HEADER_NONE,
     PAM_HEADER_COMMENT,

modules/imgcodecs/src/grfmt_png.cpp

@@ -72,7 +72,7 @@
     #pragma warning( disable: 4611 )
 #endif
 
-// the following defines are a hack to avoid multiple problems with frame ponter handling and setjmp
+// the following defines are a hack to avoid multiple problems with frame pointer handling and setjmp
 // see http://gcc.gnu.org/ml/gcc/2011-10/msg00324.html for some details
 #define mingw_getsp(...) 0
 #define __builtin_frame_address(...) 0