typo

fixes #136

README.md

@@ -913,7 +913,7 @@ Generates a symbol for the given *arguments*. The *arguments* are arbitrary; the
 
 <a name="symbol_type" href="#symbol_type">#</a> <i>symbol</i>.<b>type</b>([<i>type</i>]) [<>](https://github.com/d3/d3-shape/blob/master/src/symbol.js#L33 "Source")
 
-If *type* is specified, sets the symbol type to the specified function or symbol type and returns this line generator. If *type* is a function, the symbol generator’s arguments and *this* are passed through. (See [*selection*.attr](https://github.com/d3/d3-selection/blob/master/README.md#selection_attr) if you are using d3-selection.) If *type* is not specified, returns the current symbol type accessor, which defaults to:
+If *type* is specified, sets the symbol type to the specified function or symbol type and returns this symbol generator. If *type* is a function, the symbol generator’s arguments and *this* are passed through. (See [*selection*.attr](https://github.com/d3/d3-selection/blob/master/README.md#selection_attr) if you are using d3-selection.) If *type* is not specified, returns the current symbol type accessor, which defaults to:
 
 ```js
 function type() {