Bump up doc version for 0.50.0 release (#1874)

Author: Jager-yoo

README.md

@@ -547,7 +547,7 @@ advanced usages.
 The documentation for releases and `main` are available here:
 
 * [`main`](https://pointfreeco.github.io/swift-composable-architecture/main/documentation/composablearchitecture)
-* [0.50.0](https://pointfreeco.github.io/swift-composable-architecture/0.49.0/documentation/composablearchitecture/)
+* [0.50.0](https://pointfreeco.github.io/swift-composable-architecture/0.50.0/documentation/composablearchitecture/)
 
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