README: give exif()'s formats as examples, TIFF among them

The read surface listed JPEG, HEIC/HEIF, AVIF, PNG and WebP as every
format exif() reads, but exifreader reads more, so "any other original
gives {}" was false. The list is now examples.

Model: opus-5-5

README.md

@@ -725,9 +725,9 @@ Four async methods may download:
   each absent when the file lacks it. GPS values are signed decimal degrees and
   metres. `dateTimeOriginal` is the camera's clock reading held in the `Date`'s
   UTC fields; `offsetTimeOriginal`, when present, is that clock's offset from
-  UTC. EXIF is read from any image format exifreader reads: JPEG, HEIC/HEIF,
-  AVIF, PNG and WebP, a live photo's image included. Any other original gives
-  `{}`, and a video gives `{}` without being downloaded.
+  UTC. EXIF is read from any image format exifreader reads (such as JPEG,
+  HEIC/HEIF, AVIF, PNG, WebP and TIFF), a live photo's image included. Any other
+  original gives `{}`, and a video gives `{}` without being downloaded.
 
 They serve from the on-disk content cache when the bytes are present and
 otherwise fetch through the pools; `original()`, `content()` and `exif()` also