docs(cdk/table): document fixedLayout and recycleRows

Author: MichaelJamesParsons

src/cdk/table/table.md

@@ -135,6 +135,16 @@ updates. This can be based on _anything_: websocket connections, user interactio
 time-based intervals, etc. Most commonly, updates will be triggered by user interactions like
 sorting and pagination.
 
+##### `fixedLayout`
+Native tables calculate column widths from the content within each cell. Because of this, the CDK
+table measures the dimensions of sticky elements when its underlying data changes to check if their
+widths have also changed.  Enabling `fixedLayout` will enforce uniform column widths so the table
+can reliably cache their widths. This can reduce rendering latency for large native tables.
+
+```html
+<table cdk-table [dataSource]="dataSource" fixedLayout>
+```
+
 ##### `trackBy`
 
 To improve performance, a `trackBy` function can be provided to the table similar to Angular’s
@@ -145,6 +155,16 @@ table how to uniquely identify rows to track how the data changes with each upda
 <table cdk-table [dataSource]="dataSource" [trackBy]="myTrackById">
 ```
 
+##### `recycleRows`
+By default, `CdkTable` creates and destroys an internal Angular view for each row. This allows rows 
+to participate in animations and to toggle between different row templates with `cdkRowDefWhen`. If 
+you don't need these features, you can instruct the table to cache and recycle rows by specifying 
+`recycleRows`.
+
+```html
+<table cdk-table [dataSource]="dataSource" recycleRows>
+```
+
 ### Alternate HTML to using native table
 
 The CDK table does not require that you use a native HTML table. If you want to have full control