chore(docs): minor update to formatting of API link in README (#199)

README.md

@@ -12,7 +12,7 @@ The Modern Treasury Java SDK is similar to the Modern Treasury Kotlin SDK but wi
 
 ## Documentation
 
-The REST API documentation can be found [on docs.moderntreasury.com](https://docs.moderntreasury.com).
+The REST API documentation can be found on [docs.moderntreasury.com](https://docs.moderntreasury.com).
 
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