Small changes for formatting and grammar (#546)

* Use 'code' syntax on the entire command

* Minor grammar adjustment

* Sync pluralization

Author: eallrich

_includes/common/performance.md

@@ -1290,7 +1290,7 @@ There are some limits in place to ensure the API can provide the data you need i
 
 * Queries return 100 objects by default. Use the `limit` parameter to change this.
 * Skips and limits can only be used on the outer query.
-* Constraints that collide with each other will result in only one of the constraint being applied. An example of this would be two `equalTo` constraints over the same key with two different values, which contradicts itself (perhaps you're looking for 'contains').
+* Constraints that collide with each other will result in only one of the constraints being applied. An example of this would be two `equalTo` constraints over the same key with two different values, which contradicts itself (perhaps you're looking for 'contains').
 * No geo-queries inside compound OR queries.
 * Using `$exists: false` is not advised.
 * The `each` query method in the JavaScript SDK cannot be used in conjunction with queries using geo-point constraints.

_includes/parse-server/cache-adapters.md

@@ -26,7 +26,7 @@ var api = new ParseServer({
 });
 ```
 
-The `redisOptions` are passed directly to the redis.createClient method. For more informations, refer to the [redis.createClient](https://www.npmjs.com/package/redis#rediscreateclient) documentation.
+The `redisOptions` are passed directly to the redis.createClient method. For more information refer to the [redis.createClient](https://www.npmjs.com/package/redis#rediscreateclient) documentation.
 
 Note that at the moment, only passing a single argument is supported.
 

_includes/parse-server/deploying-heroku-mlab.md

@@ -8,7 +8,7 @@ Here are the steps:
 2. Create a Heroku account (if you don’t have one already) and use the Heroku Toolbelt to log in and prepare a new app in the same directory as your Express app. Take a look at Heroku's [Getting Started with Node.js guide](https://devcenter.heroku.com/articles/getting-started-with-nodejs#introduction) for more details.
 3. Use the mLab addon: `heroku addons:create mongolab:sandbox` (or, you can create a Mongo instance yourself, either directly with mLab or your own box)
 4. Use heroku config and note the URI provided by mLab under the var MONGOLAB_URI
-5. Copy this URI and set it as a new config variable: heroku config:set `DATABASE_URI=mongodb://...`
+5. Copy this URI and set it as a new config variable: `heroku config:set DATABASE_URI=mongodb://...`
 6. Deploy it: `git push heroku master`
 
 You may also refer to the Heroku Dev Center article on [Deploying a Parse Server to Heroku](https://devcenter.heroku.com/articles/deploying-a-parse-server-to-heroku).