chore: Update README.md (#175)

A few minor changes
Signed-off-by: Derek Wang <whynowy@gmail.com>

README.md

@@ -8,15 +8,15 @@
 
 ## Summary
 
-Numaflow is a Kubernetes-native platform for running massive parallel data processing and streaming jobs.
+Numaflow is a Kubernetes-native platform for running massively parallel data processing and streaming jobs.
 
-A Numaflow Pipeline is implemented as a Kubernetes custom resource, and consists of one or more source, data processing, and sink vertices.
+A Numaflow Pipeline is implemented as a Kubernetes custom resource, and consists of one or more sources, data processing and sink vertices.
 
-Numaflow installs in a few minutes and is easier and cheaper to use for simple data processing applications than full-featured stream processing platforms.
+Numaflow installs in a few minutes and is easier and cheaper to use for simple data processing applications than a full-featured stream processing platforms.
 
 ## Key Features
 
-- Kubernetes-native: If you know Kubernetes, you already know 90% of what you need to use Numaflow.
+- Kubernetes-native: If you know Kubernetes, you already know how to use Numaflow.
 - Language agnostic: Use your favorite programming language.
 - Exactly-Once semantics: No input element is duplicated or lost even as pods are rescheduled or restarted.
 - Auto-scaling with back-pressure: Each vertex automatically scales from zero to whatever is needed.