Fix name of JSON notify_details field in documentation

JSON field names are lowercase_underscore not camelCase.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I1bb4c2322d04ee9c2827a568c24101b7723e95c0
diff --git a/resources/Documentation/rest-api-checks.md b/resources/Documentation/rest-api-checks.md
index bbab437..a152652 100644
--- a/resources/Documentation/rest-api-checks.md
+++ b/resources/Documentation/rest-api-checks.md
@@ -205,7 +205,7 @@
 | `started`       | optional | The [timestamp](../../../Documentation/rest-api.html#timestamp) of when the check started processing.
 | `finished`      | optional | The [timestamp](../../../Documentation/rest-api.html#timestamp) of when the check finished processing.
 | `notify`        | optional | Notify handling that defines to whom email notifications should be sent when the combined check state changes due to posting this check. Allowed values are `NONE`, `OWNER`, `OWNER_REVIEWERS` and `ALL`. If not set, the default is `ALL`.
-| `notifyDetails`| optional | Additional information about whom to notify when the combined check state changes due to posting this check as a map of recipient type to [NotifyInfo](../../../Documentation/rest-api-changes.html#notify-info) entity.
+| `notify_details`| optional | Additional information about whom to notify when the combined check state changes due to posting this check as a map of recipient type to [NotifyInfo](../../../Documentation/rest-api-changes.html#notify-info) entity.
 
 ### <a id="rerun-input"> RerunInput
 The `RerunInput` entity contains information for rerunning a check.
@@ -213,7 +213,7 @@
 | Field Name      |          | Description |
 | --------------- | -------- | ----------- |
 | `notify`        | optional | Notify handling that defines to whom email notifications should be sent when the combined check state changes due to rerunning this check. Allowed values are `NONE`, `OWNER`, `OWNER_REVIEWERS` and `ALL`. If not set, the default is `ALL`.
-| `notifyDetails`| optional | Additional information about whom to notify when the combined check state changes due to rerunning this check as a map of recipient type to [NotifyInfo](../../../Documentation/rest-api-changes.html#notify-info) entity.
+| `notify_details`| optional | Additional information about whom to notify when the combined check state changes due to rerunning this check as a map of recipient type to [NotifyInfo](../../../Documentation/rest-api-changes.html#notify-info) entity.
 
 ### <a id="check-state"> CheckState (enum)
 The `CheckState` enum can have the following values: `NOT_STARTED`, `FAILED`,