Fixed grammar in docs introduction page.
@@ -51,7 +51,7 @@ Quoting from Eric Evans' book `Domain Driven Design
Although the basic event sourcing patterns are quite simple, and
can be reproduced in code for each project, the persistence mechanism
for event sourced domain driven design appears as a conceptually cohesive
-mechanism, and so have been "partitioned into a separate lightweight framework".
+mechanism, and so can be "partitioned into a separate lightweight framework".
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