Merge pull request #7313 from mburke5678/BZ-1517586

Update scheduling docs per BZ

Author: mburke5678

_topic_map.yml

@@ -591,6 +591,8 @@ Topics:
     File: descheduler
   - Name: Custom Scheduling
     File: custom_scheduler
+  - Name: Controlling Pod Placement
+    File: pod_placement
   - Name: Advanced Scheduling
     File: scheduler-advanced
   - Name: Advanced Scheduling and Node Affinity

admin_guide/scheduling/index.adoc

@@ -16,6 +16,10 @@ toc::[]
 Pod scheduling is an internal process that determines placement of new
 pods onto nodes within the cluster.
 
+The scheduler code has a clean separation that watches new pods
+as they get created and identifies the most suitable node to host them. It then
+creates bindings (pod to node bindings) for the pods using the master API.
+
 [[admin-guide-scheduling-index-default]]
 == Default scheduling
 
@@ -36,3 +40,4 @@ For information about advanced scheduling, see xref:../../admin_guide/scheduling
 {product-title} also allows you to use your own or third-party schedulers by editing the pod specification. 
 
 For more information, see xref:../../admin_guide/scheduling/custom_scheduler.adoc#admin-guide-sched-custom[Custom Schedulers].
+