Revert "Documentation for #13110"

This reverts commit 5f94563.

Signed-off-by: Philipp Wollermann <philwo@google.com>

site/docs/exec-groups.md

@@ -132,13 +132,6 @@ All actions with `exec_group = "link"` would see the exec properties
 dictionary as `{"mem": "16g"}`. As you see here, execution-group-level
 settings override target-level settings.
 
-### Execution groups for native rules
-
-The following execution groups are available for actions defined by native rules:
-
-* `test`: Test runner actions.
-* `cpp_link`: C++ linking actions.
-
 ### Creating exec groups to set exec properties
 
 Sometimes you want to use an exec group to give specific actions different exec
@@ -169,36 +162,3 @@ my_rule = rule(
 #
 ```
 
-### Execution groups and platform execution properties
-
-It is possible to define `exec_properties` for arbitrary execution groups on
-platform targets (unlike `exec_properties` set directly on a target, where
-properties for unknown execution groups are rejected). Targets then inherit the
-execution platform's `exec_properties` that affect the default execution group
-and any other relevant execution groups.
-
-For example, suppose running a C++ test requires some resource to be available,
-but it isn't required for compiling and linking; this can be modelled as
-follows:
-
-```python
-constraint_setting(name = "resource")
-constraint_value(name = "has_resource", constraint_setting = ":resource")
-
-platform(
-    name = "platform_with_resource",
-    constraint_values = [":has_resource"],
-    exec_properties = {
-        "test.resource": "...",
-    },
-)
-
-cc_test(
-    name = "my_test",
-    srcs = ["my_test.cc"],
-    exec_compatible_with = [":has_resource"],
-)
-```
-
-`exec_properties` defined directly on targets take precedence over those that
-are inherited from the execution platform.