improve @target docs around not using decorators

Author: keithamus

docs/_guide/targets.md

@@ -138,21 +138,32 @@ Important to note here is that nodes from the `shadowRoot` get returned _first_.
 
 ### What about without Decorators?
 
-If you're using decorators, then the `@target` and `@targets` decorators will turn the decorated properties into getters.
+If you're not using decorators, then the `@target` and `@targets` decorators have an escape hatch: you can define a static class field using the `[target.static]` computed property, as an array of key names. Like so:
 
-If you're not using decorators, then you'll need to make a `getter`, and call `findTarget(this, key)` or `findTargets(this, key)` in the getter, for example:
+```js
+import {controller, target, targets} from '@github/catalyst'
+
+controller(class HelloWorldElement extends HTMLElement {
+  // The same as `@target output`
+  [target.static] = ['output']
+
+  // The same as `@targets pages; @targets links`
+  [targets.static] = ['pages', 'links']
+
+})
+```
+
+This is functionally identical to:
 
 ```js
-import {findTarget, findTargets} from '@github/catalyst'
-class HelloWorldElement extends HTMLElement {
+import {controller} from '@github/catalyst'
 
-  get output() {
-    return findTarget(this, 'output')
-  }
+@controller
+class HelloWorldElement extends HTMLElement {
+  @target output
 
-  get pages() {
-    return findTargets(this, 'pages')
-  }
+  @targets pages
+  @targets links
 
 }
-```
+```