book: Change "Failures" to "Errors" in doc special sections chapter

This matches the usage in the standard library's documentation.

diff --git a/src/doc/book/documentation.md b/src/doc/book/documentation.md
index 4053e5776e39f89982e5e2cacde47d52adb3245f..ede3100194e5bd308e9f2a47c2373bd3519ced57 100644 (file)
--- a/src/doc/book/documentation.md
+++ b/src/doc/book/documentation.md
@@ -118,7 +118,7 @@ least. If your function has a non-trivial contract like this, that is
 detected/enforced by panics, documenting it is very important.
 
 ```rust
-/// # Failures
+/// # Errors
 # fn foo() {}
 ```