Update doc comments in chains.rs
/// alignment).
/// E.g., `let foo = { aaaa; bbb; ccc }.bar.baz();`, we would layout for the
/// following values of `chain_indent`:
-/// Visual:
-/// ```
-/// let foo = {
-/// aaaa;
-/// bbb;
-/// ccc
-/// }
-/// .bar
-/// .baz();
-/// ```
-/// Inherit:
+/// Block:
/// ```
/// let foo = {
/// aaaa;
/// bbb;
/// ccc
-/// }
-/// .bar
+/// }.bar
/// .baz();
/// ```
-/// Tabbed:
+/// Visual:
/// ```
/// let foo = {
/// aaaa;
///
/// If the first item in the chain is a block expression, we align the dots with
/// the braces.
-/// Visual:
-/// ```
-/// let a = foo.bar
-/// .baz()
-/// .qux
-/// ```
-/// Inherit:
+/// Block:
/// ```
/// let a = foo.bar
/// .baz()
/// .qux
/// ```
-/// Tabbed:
+/// Visual:
/// ```
/// let a = foo.bar
/// .baz()
