exiftool: Add "-gps*=" removal example (#9522)

* exiftool: Add "-gps*=" removal example

A common use of exiftool is removing location data from photos.  One may wish to preserve most EXIF data (ex. rotation, date/time taken, etc.) but remove private location data.  This example accomplishes this common task.

The proposed example comes from exiftool's author, Phil Harvey:
https://exiftool.org/forum/index.php?topic=6037.msg29731#msg29731

This example works to not only remove GPS data from EXIF but also from Adobe's XMP tags.

Tested with JPEG and HEIC photos using exiftool 12.50.

pages/common/exiftool.md

@@ -11,6 +11,10 @@
 
 `exiftool -All= {{file1 file2 ...}}`
 
+- Remove GPS EXIF metadata from given image files:
+
+`exiftool "-gps*=" {{path/to/image1 path/to/image2 ...}}`
+
 - Remove all EXIF metadata from the given image files, then re-add metadata for color and orientation:
 
 `exiftool -All= -tagsfromfile @ -colorspacetags -orientation {{image1 image2 ...}}`