Fix text

Signed-off-by: Etienne Millon <me@emillon.org>

src/dune_lang/package_name.ml

@@ -25,8 +25,8 @@ module Strict = struct
       let description_of_valid_string =
         Some
           (Pp.textf
-             "Package names can contain letters, '-', '_' and '+', and need to contain \
-              at least a letter.")
+             "Package names can contain letters, numbers, '-', '_' and '+', and need to \
+              contain at least a letter.")
       ;;
 
       let of_string_opt s =

test/blackbox-tests/test-cases/package-name-strict.t

@@ -25,8 +25,8 @@ Validation:
   3 |  (name some&name)
              ^^^^^^^^^
   Error: "some&name" is an invalid package name.
-  Package names can contain letters, '-', '_' and '+', and need to contain at
-  least a letter.
+  Package names can contain letters, numbers, '-', '_' and '+', and need to
+  contain at least a letter.
   Hint: some_name would be a correct package name
   [1]
 
@@ -41,8 +41,8 @@ When all characters are removed, a valid name is suggested:
   3 |  (name 0)
              ^
   Error: "0" is an invalid package name.
-  Package names can contain letters, '-', '_' and '+', and need to contain at
-  least a letter.
+  Package names can contain letters, numbers, '-', '_' and '+', and need to
+  contain at least a letter.
   Hint: p0 would be a correct package name
   [1]
 
@@ -57,7 +57,7 @@ But it needs at least a letter:
   3 |  (name 0-9)
              ^^^
   Error: "0-9" is an invalid package name.
-  Package names can contain letters, '-', '_' and '+', and need to contain at
-  least a letter.
+  Package names can contain letters, numbers, '-', '_' and '+', and need to
+  contain at least a letter.
   Hint: p0-9 would be a correct package name
   [1]