spec: correct example comment in Conversions from slice to array

Fixes #47280

Change-Id: I78a8d235949b4878c7f075ac4ca37700e7e6c31c
GitHub-Last-Rev: 067f96e
GitHub-Pull-Request: #47282
Reviewed-on: https://go-review.googlesource.com/c/go/+/335470
Reviewed-by: Robert Griesemer <[email protected]>
Trust: Robert Griesemer <[email protected]>
Trust: Than McIntosh <[email protected]>

Author: helloPiers

doc/go_spec.html

@@ -4334,7 +4334,7 @@ <h4 id="Conversions_from_slice_to_array_pointer">Conversions from slice to array
 
 var t []string
 t0 := (*[0]string)(t)    // t0 == nil
-t1 := (*[1]string)(t)    // panics: len([1]string) > len(s)
+t1 := (*[1]string)(t)    // panics: len([1]string) > len(t)
 </pre>
 
 <h3 id="Constant_expressions">Constant expressions</h3>