PROPOSAL - consistent parameter description formatting

Currently the parameter listing has very inconsistent formatting. They should be consistent.

These are the current variations:

![everydayhero_api__campaigns](https://f.cloud.github.com/assets/486512/1369080/88e1ca28-39d4-11e3-8d4c-a44d11245af3.jpg)
![everydayhero_api__leaderboards](https://f.cloud.github.com/assets/486512/1369081/8dbfffc4-39d4-11e3-9fb2-e5ded3cd82dc.jpg)
![everydayhero_api__users](https://f.cloud.github.com/assets/486512/1369082/901734c2-39d4-11e3-92e9-505f0f567c69.jpg)
![everydayhero_api__oauth_integration](https://f.cloud.github.com/assets/486512/1369083/9252aa46-39d4-11e3-8cef-49787dafdcd8.jpg)

We would like to make it consistent across the site, and are proposing the following format:

![everydayhero_api__campaigns](https://f.cloud.github.com/assets/486512/1369143/0a503916-39d8-11e3-96e1-b35cf68de1f7.jpg)

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- [x] peer review
- [x] @HelenRoss