Update Readme

Remove comment about reserved properties
preceeding -> preceding
or -> and

README.md

@@ -178,7 +178,7 @@ You must call *node*.sort before invoking a hierarchical layout if you want the
 
 <a name="node_each" href="#node_each">#</a> <i>node</i>.<b>each</b>(<i>function</i>) [<>](https://github.com/d3/d3-hierarchy/blob/master/src/hierarchy/each.js "Source")
 
-Invokes the specified *function* for *node* and each descendant in [breadth-first order](https://en.wikipedia.org/wiki/Breadth-first_search), such that a given *node* is only visited if all nodes of lesser depth have already been visited, as well as all preceeding nodes of the same depth. The specified function is passed the current *node*.
+Invokes the specified *function* for *node* and each descendant in [breadth-first order](https://en.wikipedia.org/wiki/Breadth-first_search), such that a given *node* is only visited if all nodes of lesser depth have already been visited, as well as all preceding nodes of the same depth. The specified function is passed the current *node*.
 
 <a name="node_eachAfter" href="#node_eachAfter">#</a> <i>node</i>.<b>eachAfter</b>(<i>function</i>) [<>](https://github.com/d3/d3-hierarchy/blob/master/src/hierarchy/eachAfter.js "Source")
 
@@ -266,7 +266,7 @@ Constructs a new stratify operator with the default settings.
 
 <a name="_stratify" href="#_stratify">#</a> <i>stratify</i>(<i>data</i>) [<>](https://github.com/d3/d3-hierarchy/blob/master/src/stratify.js#L20 "Source")
 
-Generates a new hierarchy from the specified tabular *data*. Each node in the returned object has a shallow copy of the properties from the corresponding data object, excluding the following reserved properties: id, parentId, children.
+Generates a new hierarchy from the specified tabular *data*.
 
 <a name="stratify_id" href="#stratify_id">#</a> <i>stratify</i>.<b>id</b>([<i>id</i>]) [<>](https://github.com/d3/d3-hierarchy/blob/master/src/stratify.js#L64 "Source")
 
@@ -534,7 +534,7 @@ If *size* is specified, sets this pack layout’s size to the specified two-elem
 
 <a name="pack_padding" href="#pack_padding">#</a> <i>pack</i>.<b>padding</b>([<i>padding</i>]) [<>](https://github.com/d3/d3-hierarchy/blob/master/src/pack/index.js#L38 "Source")
 
-If *padding* is specified, sets this pack layout’s padding accessor to the specified number or function or returns this pack layout. If *padding* is not specified, returns the current padding accessor, which defaults to the constant zero. When siblings are packed, tangent siblings will be separated by approximately the specified padding; the enclosing parent circle will also be separated from its children by approximately the specified padding. If an [explicit radius](#pack_radius) is not specified, the padding is approximate because a two-pass algorithm is needed to fit within the [layout size](#pack_size): the circles are first packed without padding; a scaling factor is computed and applied to the specified padding; and lastly the circles are re-packed with padding.
+If *padding* is specified, sets this pack layout’s padding accessor to the specified number or function and returns this pack layout. If *padding* is not specified, returns the current padding accessor, which defaults to the constant zero. When siblings are packed, tangent siblings will be separated by approximately the specified padding; the enclosing parent circle will also be separated from its children by approximately the specified padding. If an [explicit radius](#pack_radius) is not specified, the padding is approximate because a two-pass algorithm is needed to fit within the [layout size](#pack_size): the circles are first packed without padding; a scaling factor is computed and applied to the specified padding; and lastly the circles are re-packed with padding.
 
 <a name="packSiblings" href="#packSiblings">#</a> d3.<b>packSiblings</b>(<i>circles</i>) [<>](https://github.com/d3/d3-hierarchy/blob/master/src/pack/siblings.js "Source")