Update functions.md (#1065)

Functions cannot start with '_'
move-language · Jul 8, 2023 · ee12000 · ee12000
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diff --git a/language/documentation/book/src/functions.md b/language/documentation/book/src/functions.md
@@ -187,6 +187,7 @@ Function names can start with letters `a` to `z` or letters `A` to `Z`. After th
 fun FOO() {}
 fun bar_42() {}
 fun _bAZ19() {}
+    ^^^^^^ Invalid function name '_bAZ19'. Function names cannot start with '_'
 ```
 
 ### Type Parameters