OpenExec: Minor fixups to execUsd docs in prepration for the 25.08 release.

(Internal change: 2374302)

Author: adamrwoodbury

pxr/exec/execUsd/README.md

@@ -6,7 +6,7 @@ The execUsd library is built on top of [exec](../exec/README.md) and
 The execUsd library is the primary entry point for OpenExec. The API defined
 here, and in the [exec](../exec/README.md) library, supports:
 - Registration of computational behaviors associated with USD schemas
-- Ingesting UsdStage%s to compile data flow networks that contain nodes that
+- Ingesting a UsdStage to compile the data flow network that contains nodes that
   embody computations
 - Requesting values for efficient, vectorized, multithreaded evaluation
 

pxr/exec/execUsd/docs/overview.md

@@ -55,13 +55,14 @@ for a desciption of the builtin computations that are available.
 ## Tutorials {#section_Tutorials}
 
 - [Tutorial 1: Computing Values](tutorial1ComputingValues.md)
-- [Tutorial 2: Invalidation](tutorial2Invalidation.md)
-- [Tutorial 3: Defining Schema Computations](tutorial3DefiningComputations.md)
+
+**Coming Soon:**
+- Tutorial 2: Defining Schema Computations
 
 
 ## Advanced Topics {#section_AdvancedTopics}
 
-TODO:
+**Coming Soon:**
+- Caching, invalidation, and invalidation notification
 - Exec architecture/phases of execution: compilation, scheduling, evaluation
 - Dispatched computations
-- Anything else?