Update gallery sample post with Magnific Popup captions

_posts/2010-09-09-post-gallery.md

@@ -10,21 +10,27 @@ gallery:
   - url: unsplash-gallery-image-1.jpg
     image_path: unsplash-gallery-image-1-th.jpg
     alt: "placeholder image 1"
+    title: "Image 1 title caption"
   - url: unsplash-gallery-image-2.jpg
     image_path: unsplash-gallery-image-2-th.jpg
     alt: "placeholder image 2"
+    title: "Image 2 title caption"
   - url: unsplash-gallery-image-3.jpg
     image_path: unsplash-gallery-image-3-th.jpg
     alt: "placeholder image 3"
+    title: "Image 3 title caption"
   - url: unsplash-gallery-image-1.jpg
     image_path: unsplash-gallery-image-1-th.jpg
-    alt: "placeholder image 1"
+    alt: "placeholder image 4"
+    title: "Image 4 title caption"
   - url: unsplash-gallery-image-2.jpg
     image_path: unsplash-gallery-image-2-th.jpg
-    alt: "placeholder image 2"
+    alt: "placeholder image 5"
+    title: "Image 5 title caption"
   - url: unsplash-gallery-image-3.jpg
     image_path: unsplash-gallery-image-3-th.jpg
-    alt: "placeholder image 3"
+    alt: "placeholder image 6"
+    title: "Image 6 title caption"
 gallery2:
   - url: https://flic.kr/p/8a6Ven
     image_path: https://farm2.staticflickr.com/1272/4697500467_8294dac099_q.jpg
@@ -51,15 +57,19 @@ gallery:
   - url: unsplash-gallery-image-1.jpg
     image_path: unsplash-gallery-image-1-th.jpg
     alt: "placeholder image 1"
+    title: "Image 1 title caption"
   - url: unsplash-gallery-image-2.jpg
     image_path: unsplash-gallery-image-2-th.jpg
     alt: "placeholder image 2"
+    title: "Image 2 title caption"
   - url: unsplash-gallery-image-3.jpg
     image_path: unsplash-gallery-image-3-th.jpg
     alt: "placeholder image 3"
+    title: "Image 3 title caption"
   - url: unsplash-gallery-image-4.jpg
     image_path: unsplash-gallery-image-4-th.jpg
     alt: "placeholder image 4"
+    title: "Image 4 title caption"
 ```
 
 And then drop-in the gallery include --- gallery `caption` is optional.