fix(docs): code sample for cloud.Function that doesn't compile (#6054)

Fix multiple errors in code sample of cloud.Function that doesn't compile.

## Checklist

- [X] Title matches [Winglang's style guide](https://www.winglang.io/contributing/start-here/pull_requests#how-are-pull-request-titles-formatted)
- [X] Description explains motivation and solution
- [ ] Tests added (always)
- [X] Docs updated (only required for features)
- [ ] Added `pr/e2e-full` label if this feature requires end-to-end testing

*By submitting this pull request, I confirm that my contribution is made under the terms of the [Wing Cloud Contribution License](https://github.com/winglang/wing/blob/main/CONTRIBUTION_LICENSE.md)*.

.gitignore

@@ -29,3 +29,5 @@ target/
 
 # turbo
 .turbo/
+
+.history/

docs/docs/04-standard-library/cloud/function.md

@@ -34,8 +34,8 @@ bring cloud;
 bring util;
 
 // defining a cloud.Function resource
-let countWords = new cloud.Function(inflight (s: str): str => {
-  return "${s.split(" ").length}";
+let countWords = new cloud.Function(inflight (s: str?): str => {
+  return "{s?.split(" ")?.length ?? 0}";
 }) as "countWords";
 
 let longTask = new cloud.Function(inflight () => {
@@ -47,7 +47,7 @@ new cloud.Function(inflight () => {
   let sentence = "I am a sentence with 7 words";
   // invoking cloud.Function from inflight context
   let wordsCount = countWords.invoke(sentence);
-  log("'${sentence}' has ${wordsCount} words");
+  log("'{sentence}' has {wordsCount ?? "0"} words");
 
   longTask.invokeAsync("");
   log("task started");

libs/wingsdk/src/cloud/function.md

@@ -34,8 +34,8 @@ bring cloud;
 bring util;
 
 // defining a cloud.Function resource
-let countWords = new cloud.Function(inflight (s: str): str => {
-  return "${s.split(" ").length}";
+let countWords = new cloud.Function(inflight (s: str?): str => {
+  return "{s?.split(" ")?.length ?? 0}";
 }) as "countWords";
 
 let longTask = new cloud.Function(inflight () => {
@@ -47,7 +47,7 @@ new cloud.Function(inflight () => {
   let sentence = "I am a sentence with 7 words";
   // invoking cloud.Function from inflight context
   let wordsCount = countWords.invoke(sentence);
-  log("'${sentence}' has ${wordsCount} words");
+  log("'{sentence}' has {wordsCount ?? "0"} words");
 
   longTask.invokeAsync("");
   log("task started");