Use place holder values for rules_haskell attrs in start script and docs

This ensures that we don't accidentally run tests on old releases.

Author: avdv

docs/haskell-use-cases.rst

@@ -28,9 +28,9 @@ rules_haskell. To use a released version, do the following::
 
   http_archive(
       name = "rules_haskell",
-      sha256 = "34742848a8882d94a0437b3b1917dea6f58c82fe5762afe8d249d3a36e51935d",
-      strip_prefix = "rules_haskell-0.19",
-      url = "https://github.com/tweag/rules_haskell/releases/download/v0.19/rules_haskell-0.19.tar.gz",
+      sha256 = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
+      strip_prefix = "rules_haskell-M.NN",
+      url = "https://github.com/tweag/rules_haskell/releases/download/vM.NN/rules_haskell-M.NN.tar.gz",
   )
 
 Picking a compiler

start

@@ -251,9 +251,9 @@ load(
 # Download rules_haskell and make it accessible as "@rules_haskell".
 http_archive(
     name = "rules_haskell",
-    sha256 = "34742848a8882d94a0437b3b1917dea6f58c82fe5762afe8d249d3a36e51935d",
-    strip_prefix = "rules_haskell-0.19",
-    url = "https://github.com/tweag/rules_haskell/releases/download/v0.19/rules_haskell-0.19.tar.gz",
+    sha256 = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
+    strip_prefix = "rules_haskell-M.NN",
+    url = "https://github.com/tweag/rules_haskell/releases/download/vM.NN/rules_haskell-M.NN.tar.gz",
 )
 
 load(
@@ -376,7 +376,7 @@ if $BZLMOD; then
     cat >MODULE.bazel <<EOF
 module(name = "your_project_name_here", version = "0.1")
 
-bazel_dep(name = "rules_haskell", version = "0.19")
+bazel_dep(name = "rules_haskell", version = "0.0")
 bazel_dep(name = "rules_cc", version = "0.0.9")
 
 haskell_toolchains = use_extension(