POD and spelling fixes

Libtmp/Image2D/image2d.pd

@@ -1021,8 +1021,8 @@ and vectorized for PDL by Karl Glazebrook.
   # $tri is 0 everywhere except for points in polygon interior
   $tri = $img->pnpoly($ps);
 
-  With the second form, the x and y coordinates must also be specified.
-  B< I<THIS IS MAINTAINED FOR BACKWARD COMPATIBILITY ONLY> >.
+With the second form, the x and y coordinates must also be specified.
+B< I<THIS IS MAINTAINED FOR BACKWARD COMPATIBILITY ONLY> >.
 
   $px = pdl( 3, 20, 34 );
   $py = pdl( 3, 20,  3 );

Libtmp/ImageND/imagend.pd

@@ -517,7 +517,7 @@ Speed-optimized convolution with selectable boundary conditions
 
   $new = convolveND($x, $kernel, [ {options} ]);
 
-Conolve an array with a kernel, both of which are N-dimensional.
+Convolve an array with a kernel, both of which are N-dimensional.
 
 If the kernel has fewer dimensions than the array, then the extra array
 dimensions are broadcasted over.  There are options that control the boundary

Libtmp/ImageRGB/imagergb.pd

@@ -70,7 +70,7 @@ quantize and reduce colours in 8-bit images
 This function does color reduction for <=8bit displays and accepts 8bit RGB
 and 8bit palette images. It does this through an interface to the ppm_quant
 routine from the pbmplus package that implements the median cut routine which
-intellegently selects the 'best' colors to represent your image on a <= 8bit
+intelligently selects the 'best' colors to represent your image on a <= 8bit
 display (based on the median cut algorithm). Optional args: $ncols sets the
 maximum nunmber of colours used for the output image (defaults to 256).
 There are images where a different color