address concerns that depwarn for transpose is unclear (#19205)

* close #18320

* Update NEWS.md

* Update deprecated.jl

* Update deprecated.jl

Author: cjprybol

NEWS.md

@@ -508,8 +508,9 @@ Deprecated or removed
   * Sparse matrix functions `etree`, `ereach`, `csc_permute`, and `symperm` have been moved
     to the [SuiteSparse.jl package](https://github.com/JuliaSparse/SuiteSparse.jl) ([#12231], [#17033]).
 
-  * The no-op `transpose` fallback has been deprecated. Consider introducing suitable
-    `transpose` methods or calling `permutedims(x, [2,1])` ([#13171], [#17075], [#17374]).
+  * The no-op `transpose` fallback for non-numeric arrays has been deprecated. Consider introducing suitable
+    `transpose` methods or calling `permutedims(x, (2, 1))` for matrices and `reshape(x, 1, length(x))` for
+    vectors.  ([#13171], [#17075], [#17374]).
 
   * The following macros have been deprecated ([#16219]):
     * `@windows` is deprecated in favor of `is_windows()`

base/deprecated.jl

@@ -765,9 +765,10 @@ end
 
 # Deprecate no-op transpose fallback. Please see #13171 and #17075.
 function transpose(x)
-    depwarn(string("the no-op `transpose` fallback is deprecated, and no more specific ",
-        "`transpose` method for $(typeof(x)) exists. Consider `permutedims(x, [2, 1])` ",
-        "or writing a specific `transpose(x::$(typeof(x)))` method if appropriate."),
+    depwarn(string("the no-op `transpose` for non-numeric arrays is deprecated, ",
+        "and no specific `transpose` method for $(typeof(x)) exists. Use ",
+        "`permutedims(x, (2, 1))` for matrices and `reshape(x, 1, length(x))` for vectors, ",
+        "or write a specific `transpose(x::$(typeof(x)))` method if appropriate."),
         :transpose)
     return x
 end