Fix duplications in changelog and missing backtick
Fix duplications in changelog and missing backtick

garcialo/accessibility-developer-tools,alice/accessibility-developer-tools,GoogleChrome/accessibility-developer-tools,garcialo/accessibility-developer-tools,GoogleChrome/accessibility-developer-tools,garcialo/accessibility-developer-tools,seksanman/accessibility-developer-tools,ckundo/accessibility-developer-tools,ricksbrown/accessibility-developer-tools,ricksbrown/accessibility-developer-tools,GoogleChrome/accessibility-developer-tools,ricksbrown/accessibility-developer-tools,pivotal-cf/accessibility-developer-tools,pivotal-cf/accessibility-developer-tools,alice/accessibility-developer-tools,ckundo/accessibility-developer-tools,seksanman/accessibility-developer-tools,alice/accessibility-developer-tools,pivotal-cf/accessibility-developer-tools,ckundo/accessibility-developer-tools,seksanman/accessibility-developer-tools