Switch : to / in more CMake tests names. (#3647)

Follow-up to https://github.com/google/iree/commit/2e9aaa4dc0f44a18e739dba7a26f6366382a308f
diff --git a/build_tools/cmake/iree_check_test.cmake b/build_tools/cmake/iree_check_test.cmake
index d4f695b..5713a5a 100644
--- a/build_tools/cmake/iree_check_test.cmake
+++ b/build_tools/cmake/iree_check_test.cmake
@@ -91,7 +91,7 @@
 
   iree_package_ns(_PACKAGE_NS)
   string(REPLACE "::" "/" _PACKAGE_PATH ${_PACKAGE_NS})
-  set(_TEST_NAME "${_PACKAGE_PATH}:${_RULE_NAME}")
+  set(_TEST_NAME "${_PACKAGE_PATH}/${_RULE_NAME}")
 
   # Case for cross-compiling towards Android.
   if(ANDROID)
diff --git a/build_tools/cmake/iree_multipy.cmake b/build_tools/cmake/iree_multipy.cmake
index 706f6a6..a974e95 100644
--- a/build_tools/cmake/iree_multipy.cmake
+++ b/build_tools/cmake/iree_multipy.cmake
@@ -304,7 +304,7 @@
 
   iree_package_ns(_PACKAGE_NS)
   string(REPLACE "::" "/" _PACKAGE_PATH ${_PACKAGE_NS})
-  set(_NAME_PATH "${_PACKAGE_PATH}:${_RULE_NAME}")
+  set(_NAME_PATH "${_PACKAGE_PATH}/${_RULE_NAME}")
   list(APPEND _RULE_LABELS "${_PACKAGE_PATH}")
 
   foreach(V ${IREE_MULTIPY_VERSIONS_EFFECTIVE})
diff --git a/docs/developing_iree/testing_guide.md b/docs/developing_iree/testing_guide.md
index 416bc06..372e096 100644
--- a/docs/developing_iree/testing_guide.md
+++ b/docs/developing_iree/testing_guide.md
@@ -192,7 +192,7 @@
 With CMake, run this from the build directory:
 
 ```shell
-$ ctest -R iree/test/e2e/xla_ops:check_vmla_vmla_floor.mlir
+$ ctest -R iree/test/e2e/xla_ops/check_vmla_vmla_floor.mlir
 ```
 
 With Bazel, run this from the repo root: