fix: wrong result in an example from 'lang-guide' (#1390)

[Lang Ref Guide > Basic Types > Any > Example
1](https://www.nushell.sh/lang-guide/lang-guide.html#example-1)

lang-guide/lang-guide.md

@@ -152,7 +152,7 @@ if $q {
  $x = 'false'
 }
 $x
-# =>'true' a string
+# =>'false' a string
 ```
 
 #### Example 2: