Doc build: link to the right media file

The screenshot for the list of call numbers is a PNG image, not a JPEG
image, so referring to it with the appropriate extension will make it
show up in the docs and enable the epub and PDF builds to successfully
complete.

Signed-off-by: Dan Scott <dscott@laurentian.ca>

diff --git a/docs/opac/my_lists.txt b/docs/opac/my_lists.txt
index e235519..a45f29d 100644 (file)
--- a/docs/opac/my_lists.txt
+++ b/docs/opac/my_lists.txt
@@ -75,4 +75,4 @@ The call number that is displayed will be the most relevant call number to the s
 
 The local call number and associated library location will appear in the list:
 
-image::media/my_list_call_numbers.jpg[Local Call Number in List]
+image::media/my_list_call_numbers.png[Local Call Number in List]