docs: grammar fix

Alfie John · steveklabnik · commit 2c64023e3e03 · 2015-01-17T10:51:53.000-05:00
diff --git a/src/doc/trpl/compound-data-types.md b/src/doc/trpl/compound-data-types.md
@@ -297,7 +297,7 @@ enum StringResult {
 }
 ```
 Where a `StringResult` is either a `StringResult::StringOK`, with the result of
-a computation, or an `StringResult::ErrorReason` with a `String` explaining
+a computation, or a `StringResult::ErrorReason` with a `String` explaining
 what caused the computation to fail. These kinds of `enum`s are actually very
 useful and are even part of the standard library.
 

Original file line number	Diff line number	Diff line change
`@@ -297,7 +297,7 @@ enum StringResult {`
`297`	`297`	`}`
`298`	`298`	```
`299`	`299`	Where a `StringResult` is either a `StringResult::StringOK`, with the result of
`300`		-a computation, or an `StringResult::ErrorReason` with a `String` explaining
	`300`	+a computation, or a `StringResult::ErrorReason` with a `String` explaining
`301`	`301`	what caused the computation to fail. These kinds of `enum`s are actually very
`302`	`302`	`useful and are even part of the standard library.`
`303`	`303`