Display names should be written out, sentence case

display_name: (required) The topic name that will be displayed on the topic page (ex. React). Should use proper noun capitalization.

Author: endolith

topics/alternate-reality-game/index.md

@@ -1,5 +1,5 @@
 ---
-display_name: alternate-reality-game
+display_name: Alternate reality game
 topic: alternate-reality-game
 aliases: alternate-reality, arg
 related: virtual-reality

topics/interactive-fiction/index.md

@@ -1,9 +1,9 @@
 ---
-display_name: interactive-fiction
+display_name: Interactive fiction
 topic: interactive-fiction
 aliases: if
 related: visual-novel, text-adventure
 short_description: A genre of video game.
 wikipedia_url: https://en.wikipedia.org/wiki/Interactive_fiction
 ---
-Software simulating environments in which players use text commands to control characters and influence the environment.
+Software simulating environments in which players use text commands to control characters and influence the environment.