Fix AIP-193 typos. (#1386)

Author: shwoodard

aip/general/0193.md

@@ -165,15 +165,15 @@ message in the `details`, but there **may** be a `BadRequest` and a
 
 The [`ErrorInfo`][ErrorInfo] message is the required way to send a
 machine-readable identifier. All error responses **must** include an
-`ErrorInfo`payload in `details`.  Variable information **should** be
+`ErrorInfo` payload in `details`.  Variable information **should** be
 included in `metadata` in `ErrorInfo` and **must** be included if it
 appears within an error message.
 
 When introducing an error that represents a failure scenario that did
 not previously occur for the service, the payload **must** include
 `ErrorInfo` and any variables found in dynamic segments of the error
 message **must** be present in `ErrorInfo.metadata` (See [Dynamic
-variables](#dynamic-variables).
+variables](#dynamic-variables).)
 
 **Note:** `ErrorInfo` represents a special case. There **must** be
 exactly one `ErrorInfo`. It is required.