docs ($compile): add error documentation for noslot error in $compile

there was no error page for the $compile:noslot error

this resolves angular#15790

Author: Joshua Wilborn

docs/content/error/$compile/noslot.ngdoc

@@ -0,0 +1,45 @@
+@ngdoc error
+@name $compile:noslot
+@fullName No matching slot in parent directive
+@description
+
+This error occurs when declaring a specific slot in a ng-transclude which does not map to the transclude property of the directive.
+
+```js
+// In this example the template has a declared slot missing from the transclude definition.
+// This example will generate a no slot error.
+
+var componentConfig = {
+  template: '<div style="border: 1px solid black;">' +
+                '<div ng-transclude="slotProvided"></div>' +
+                '<div ng-transclude="noSlotProvided"></div>' +
+            '</div>',
+  transclude: {
+  	// The key value pairs here are considered "slots" that are provided for components to slot into.
+    slotProvided: 'slottedComponent', // mandatory transclusion,
+    optionalSlot: '?optionalComponent',  // optional transclusion
+    // there is no slot provided for the transclude 'noSlotProvided' declared in the above template
+  }
+};
+
+angular
+  .module('doc')
+  .component('myComponent', componentConfig)
+
+```
+
+```js
+\\ if we the following change we will no longer get no slot error.
+var componentConfig = {
+  template: '<div style="border: 1px solid black;">' +
+                '<div ng-transclude="slotProvided"></div>' +
+                '<div ng-transclude="noSlotProvided"></div>' +
+            '</div>',
+  transclude: {
+    slotProvided: 'slottedComponent', // mandatory transclusion,
+    optionalSlot: '?optionalComponent',  // optional transclusion,
+    noSlotProvided: 'otherComponent' // now it is declared and the error should cease
+  }
+};
+
+```