Update comments in FirstClassArrays test.

We used to reject ES3-style array declarations in strict-ES2 mode, so
this test originally expected two errors.

Change-Id: I17f71630076cda4b37b7723225dcff951eba9dcc
Bug: skia:12410
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/491997
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

resources/sksl/runtime_errors/FirstClassArrays.rts

@@ -1,6 +1,9 @@
-// Expect 2 errors
+// Expect 1 error
 
-void array_decl() { float[123] x; }
+// OK: SkSL allows ES3-style array declaration syntax. (This wouldn't work in native GLSL ES2.)
+float[123] global_var;
+void fn() { float[123] local_var; }
 
+// ERROR: SkSL (like GLSL ES2) does not allow array constructors in strict-ES2 mode.
 void array_ctor() { float[3](1, 2, 3); }
 

tests/sksl/runtime_errors/FirstClassArrays.skvm

@@ -1,4 +1,4 @@
 ### Compilation failed:
 
-error: 5: construction of array type 'float[3]' is not supported
+error: 8: construction of array type 'float[3]' is not supported
 1 error