docs: Fix typo. (#589)

PeytonT · web-flow · commit dbf6a822424d · 2020-08-07T14:40:21.000-07:00
diff --git a/docs/rules/0124/valid-reference.md b/docs/rules/0124/valid-reference.md
@@ -39,7 +39,7 @@ message Book {
 
 message GetBookRequest {
   string name = 1 [(google.api.resource_reference) = {
-    type: "library.googleapis.com/Book"  // Lint warning; referennce not found.
+    type: "library.googleapis.com/Book"  // Lint warning; reference not found.
   }]
 }
 ```

Original file line number	Diff line number	Diff line change
`@@ -39,7 +39,7 @@ message Book {`
`39`	`39`
`40`	`40`	`message GetBookRequest {`
`41`	`41`	`string name = 1 [(google.api.resource_reference) = {`
`42`		`- type: "library.googleapis.com/Book" // Lint warning; referennce not found.`
	`42`	`+ type: "library.googleapis.com/Book" // Lint warning; reference not found.`
`43`	`43`	`}]`
`44`	`44`	`}`
`45`	`45`	```