remove redundant comment

appd.adoc

@@ -356,10 +356,6 @@ formula_terms = "sigma: var1 depth: var2 z1: var3 z2: var4 a: var5 href: var6
 The `standard_name` for `depth` and the `computed_standard_name` must be one of the consistent sets shown in <<table-computed-standard-names, Table D.1>>.
 No `standard_name` has been defined for `z1`, `z2`, `a`, `href` or `k_c`.
 
-// (Leaving this comment here in case it's useful in the future!)
-// This table used to have an unusually long title, and AsciiDoctor was unable to wrap it.
-// But AsciiDoctor will wrap an image title, so the title was assigned to a 1-pixel transparent image,
-// and the table put immediately thereafter, with its own title
 [[table-computed-standard-names]]
 .Consistent sets of values for the standard_names of formula terms and the computed_standard_name
 [options="header",cols="1,3,2,3",caption="Table D.1. "]