doc/filters: add forgotten " to zoompan example

Signed-off-by: Lou Logan <lou@lrcd.com>

doc/filters.texi

@@ -8930,7 +8930,7 @@ display aspect ratio
 @item
 Zoom-in up to 1.5 and pan at same time to some spot near center of picture:
 @example
-zoompan=z=min(zoom+0.0015\,1.5):d=700:x=if(gte(zoom\,1.5)\,x\,x+1/a):y=if(gte(zoom\,1.5)\,y\,y+1):s=640x360"
+"zoompan=z=min(zoom+0.0015\,1.5):d=700:x=if(gte(zoom\,1.5)\,x\,x+1/a):y=if(gte(zoom\,1.5)\,y\,y+1):s=640x360"
 @end example
 @end itemize