Minor TurboJPEG doc tweaks

- When transforming, the worst-case JPEG buffer size depends on the
  subsampling level used in the destination image, since a grayscale
  transform might have been applied.

- Parentheses Police

turbojpeg.h

@@ -2065,13 +2065,13 @@ DLLEXPORT int tj3DecodeYUV8(tjhandle handle, const unsigned char *srcBuf,
  * you, or
  * -# pre-allocate the buffer to a "worst case" size determined by calling
  * #tj3JPEGBufSize() with the transformed or cropped width and height and the
- * level of subsampling used in the source image.  Under normal circumstances,
- * this should ensure that the buffer never has to be re-allocated.  (Setting
- * #TJPARAM_NOREALLOC guarantees that it won't be.)  Note, however, that there
- * are some rare cases (such as transforming images with a large amount of
- * embedded Exif or ICC profile data) in which the transformed JPEG image will
- * be larger than the worst-case size, and #TJPARAM_NOREALLOC cannot be used in
- * those cases.
+ * level of subsampling used in the destination image.  Under normal
+ * circumstances, this should ensure that the buffer never has to be
+ * re-allocated.  (Setting #TJPARAM_NOREALLOC guarantees that it won't be.)
+ * Note, however, that there are some rare cases (such as transforming images
+ * with a large amount of embedded Exif or ICC profile data) in which the
+ * transformed JPEG image will be larger than the worst-case size, and
+ * #TJPARAM_NOREALLOC cannot be used in those cases.
  * .
  * If you choose option 1, then `dstSizes[i]` should be set to the size of your
  * pre-allocated buffer.  In any case, unless you have set #TJPARAM_NOREALLOC,