Fix some English semantics and grammar (#16)

There were some language issues in descriptions and such that I updated be more correct.

openapi.yaml

@@ -228,7 +228,7 @@ paths:
  get:
  operationId: get-bookings
  summary: List existing bookings
- description: Returns a list of all trips booking by the authenticated user.
+ description: Returns a list of all trip bookings by the authenticated user.
  tags:
  - Bookings
  responses:
@@ -910,8 +910,8 @@ components:
  headers:
  RateLimit:
  description: |
- The RateLimit header is communicate quota policies, and contains a `limit` to
- conveys the expiring limit, `remaining` to convey the remaining quota units,
+ The RateLimit header communicates quota policies. It contains a `limit` to
+ convey the expiring limit, `remaining` to convey the remaining quota units,
  and `reset` to convey the time window reset time.
  schema:
  type: string
@@ -994,15 +994,15 @@ components:
  type: https://example.com/errors/forbidden
  title: Forbidden
  status: 403
- detail: Access is forbidden for the provided credentials.
+ detail: Access is forbidden with the provided credentials.
  application/problem+xml:
  schema:
  $ref: '#/components/schemas/Problem'
  example:
  type: https://example.com/errors/forbidden
  title: Forbidden
  status: 403
- detail: Access is forbidden for the provided credentials.
+ detail: Access is forbidden with the provided credentials.
 
  InternalServerError:
  description: Internal Server Error