refactor: add use Time.Clock for relocated Clock effect

src/default-handlers.md

@@ -8,7 +8,9 @@ providing a handler in a `run-with` block.
 For example, we can write:
 
 ```flix
-def main(): Unit \ {Clock, Env, Logger} = 
+use Time.Clock
+
+def main(): Unit \ {Clock, Env, Logger} =
     let ts = Clock.currentTime(TimeUnit.Milliseconds);
     let os = Env.getOsName();
     Logger.info("UNIX Timestamp:   ${ts}");
@@ -19,7 +21,9 @@ def main(): Unit \ {Clock, Env, Logger} =
 which the Flix compiler translates to:
 
 ```flix
-def main(): Unit \ IO = 
+use Time.Clock
+
+def main(): Unit \ IO =
     run {
         let ts = Clock.currentTime(TimeUnit.Milliseconds);
         let os = Env.getOsName();

src/effect-polymorphism.md

@@ -52,12 +52,13 @@ Here the `nth` function has a heap effect in the region `r`.
 We can also write functions that mix different effects:
 
 ```flix
-def strange(a: Array[t, r]): Unit \ {r, Clock, Net, IO} 
+use Time.Clock
+
+def strange(a: Array[t, r]): Unit \ {r, Clock, Http, IO}
                                  // ^^^^^^^^^^^^^^^^^^^ a mixture of effects
 ```
 
-This function has a heap effect `r` and three primitive effects: `Clock`,
-`Net`, and `IO`.
+This function has a heap effect `r` and three effects: `Clock`, `Http`, and `IO`.
 
 ## Higher-Order Functions
 

src/http-and-https.md

@@ -281,6 +281,7 @@ appears in the type signature:
 ```flix
 use Net.Http
 use Net.HttpResponse
+use Time.Clock
 use Time.Duration.seconds
 
 def main(): Unit \ { Clock, Http, IO } =
@@ -309,6 +310,7 @@ All three require the `Clock` effect:
 ```flix
 use Net.Http
 use Net.HttpResponse
+use Time.Clock
 use Time.Duration.{milliseconds, seconds}
 
 def main(): Unit \ { Clock, Http, IO } =
@@ -362,6 +364,7 @@ URL, default headers, retry, circuit breaker, rate limiting, and logging:
 use Net.Http
 use Net.Retry
 use Net.HttpResponse
+use Time.Clock
 use Time.Duration.{milliseconds, seconds}
 
 def main(): Unit \ { Clock, Http, Logger, IO } =