only Text and HTML *exports* should be deprecated (#43532)

Author: stevengj

base/docs/utils.jl

@@ -21,8 +21,10 @@ You can also use a stream for large amounts of data:
 
 !!! warning
     `HTML` is currently exported to maintain
-    backwards-compatibility, but is considered
-    to be deprecated and should not be used.
+    backwards compatibility, but this export
+    is deprecated. It is recommended to use
+    this type as `Docs.HTML` or to explicitly
+    import it from `Docs`.
 """
 mutable struct HTML{T}
     content::T
@@ -77,8 +79,10 @@ You can also use a stream for large amounts of data:
 
 !!! warning
     `Text` is currently exported to maintain
-    backwards-compatibility, but is considered
-    to be deprecated and should not be used.
+    backwards compatibility, but this export
+    is deprecated. It is recommended to use
+    this type as `Docs.Text` or to explicitly
+    import it from `Docs`.
 """
 mutable struct Text{T}
     content::T