Improve README wording

Co-authored-by: Robert Burke <lostluck@users.noreply.github.com>
diff --git a/README.md b/README.md
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--- a/README.md
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@@ -1,6 +1,6 @@
 # Apache Beam Swift SDK
 
-Provides [Apache Beam][0] for Swift.
+Provides the [Apache Beam][0] SDK for Swift.
 
 ## Usage