feat: fix grammar (#398)

fix grammar
## Description
fix grammar in readme
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---------

Signed-off-by: tcar <[email protected]>

packages/sdk/README.md

@@ -38,7 +38,7 @@ yarn add @buildwithsygma/sygma-sdk-core
 
 ## Example
 
-For examples of usage go the [`examples`](./examples/) folder
+For examples of usage, go to the [`examples`](./examples/) folder.
 
 ## Contracts