bug(docs): make docs match reality

Author: slack

src/reference-guide/controller-api/v2.0.md

@@ -506,7 +506,7 @@ DEIS_PLATFORM_VERSION: 2.1.0
 Example Request:
 
 ```
-POST /v2/certs/foo/domains/ HTTP/1.1
+POST /v2/certs/foo/domain/ HTTP/1.1
 Host: deis.example.com
 Authorization: token abc123
 
@@ -528,7 +528,7 @@ DEIS_PLATFORM_VERSION: 2.1.0
 Example Request:
 
 ```
-DELETE /v2/certs/foo/domains/test.com/ HTTP/1.1
+DELETE /v2/certs/foo/domain/test.com/ HTTP/1.1
 Host: deis.example.com
 Authorization: token abc123
 ```

src/reference-guide/controller-api/v2.1.md

@@ -511,7 +511,7 @@ DEIS_PLATFORM_VERSION: 2.1.0
 Example Request:
 
 ```
-POST /v2/certs/foo/domains/ HTTP/1.1
+POST /v2/certs/foo/domain/ HTTP/1.1
 Host: deis.example.com
 Authorization: token abc123
 
@@ -533,7 +533,7 @@ DEIS_PLATFORM_VERSION: 2.1.0
 Example Request:
 
 ```
-DELETE /v2/certs/foo/domains/test.com/ HTTP/1.1
+DELETE /v2/certs/foo/domain/test.com/ HTTP/1.1
 Host: deis.example.com
 Authorization: token abc123
 ```

src/reference-guide/controller-api/v2.2.md

@@ -541,7 +541,7 @@ DEIS_PLATFORM_VERSION: 2.2.0
 Example Request:
 
 ```
-POST /v2/certs/foo/domains/ HTTP/1.1
+POST /v2/certs/foo/domain/ HTTP/1.1
 Host: deis.example.com
 Authorization: token abc123
 
@@ -563,7 +563,7 @@ DEIS_PLATFORM_VERSION: 2.2.0
 Example Request:
 
 ```
-DELETE /v2/certs/foo/domains/test.com/ HTTP/1.1
+DELETE /v2/certs/foo/domain/test.com/ HTTP/1.1
 Host: deis.example.com
 Authorization: token abc123
 ```

src/reference-guide/controller-api/v2.3.md

@@ -541,7 +541,7 @@ DEIS_PLATFORM_VERSION: 2.3.0
 Example Request:
 
 ```
-POST /v2/certs/foo/domains/ HTTP/1.1
+POST /v2/certs/foo/domain/ HTTP/1.1
 Host: deis.example.com
 Authorization: token abc123
 
@@ -563,7 +563,7 @@ DEIS_PLATFORM_VERSION: 2.3.0
 Example Request:
 
 ```
-DELETE /v2/certs/foo/domains/test.com/ HTTP/1.1
+DELETE /v2/certs/foo/domain/test.com/ HTTP/1.1
 Host: deis.example.com
 Authorization: token abc123
 ```