Documentation cleanup

[lottspot]

Some methods/controllers within the codebase have inaccurate or missing documentation. These should be corrected or added. Methods/controllers which need documentation added or modified include:

• CampaignInfoStorage.prototype.fetchAll
• CampaignInfoStorage.prototype.fetchByCampaign
• CampaignStorage.prototype.fetchAll
• CandidateStorage.prototype.fetchById
• campaignInfo

[lottspot]

• campaignInfoByCandidate