[docs] Small fix in C++ documentation. (#13154)

* prepare for head node

* move command runner interface outside _private

* remove space

* Eric

* flake

* min_workers in multi node type

* fixing edge cases

* eric not idle

* fix target_workers to consider min_workers of node types

* idle timeout

* minor

* minor fix

* test

* lint

* eric v2

* eric 3

* min_workers constraint before bin packing

* Update resource_demand_scheduler.py

* Revert "Update resource_demand_scheduler.py"

This reverts commit 818a63a2c86d8437b3ef21c5035d701c1d1127b5.

* reducing diff

* make get_nodes_to_launch return a dict

* merge

* weird merge fix

* auto fill instance types for AWS

* Alex/Eric

* Update doc/source/cluster/autoscaling.rst

* merge autofill and input from user

* logger.exception

* make the yaml use the default autofill

* docs Eric

* remove test_autoscaler_yaml from windows tests

* lets try changing the test a bit

* return test

* lets see

* edward

* Limit max launch concurrency

* commenting frac TODO

* move to resource demand scheduler

* use STATUS UP TO DATE

* Eric

* make logger of gc freed refs debug instead of info

* add cluster name to docker mount prefix directory

* grrR

* fix tests

* moving docker directory to sdk

* move the import to prevent circular dependency

* smallf fix

* ian

* fix max launch concurrency bug to assume failing nodes as pending and consider only load_metric's connected nodes as running

* small fix

* deflake test_joblib

* lint

* placement groups bypass

* remove space

* Eric

* first ocmmit

* lint

* exmaple

* documentation

* hmm

* file path fix

* fix test

* some format issue in docs

* modified docs

Co-authored-by: Ameer Haj Ali <ameerhajali@ameers-mbp.lan>
Co-authored-by: Alex Wu <alex@anyscale.io>
Co-authored-by: Alex Wu <itswu.alex@gmail.com>
Co-authored-by: Eric Liang <ekhliang@gmail.com>
Co-authored-by: Ameer Haj Ali <ameerhajali@Ameers-MacBook-Pro.local>
Co-authored-by: root <root@ip-172-31-56-188.us-west-2.compute.internal>

doc/source/index.rst

@@ -119,9 +119,9 @@ Ray provides Python, Java, and *EXPERIMENTAL* C++ API. And Ray uses Tasks (funct
     | - Build ray from source with *bazel* as shown `here <https://docs.ray.io/en/master/development.html#building-ray-full>`__.
     | - Run `"cd ray/cpp"`.
     | - Run `"cp dev_BUILD.bazel BUILD.bazel"`.
-    | - Modify `src/ray/example.cc`.
+    | - Modify `src/ray/example/example.cc`.
     | - Run `"ray stop"`.
-    | - Run `"bazel build //cpp:example"`.
+    | - Run `"bazel build //cpp:all"`.
     | - Run `"bazel run //cpp:example"`.
 
     .. literalinclude:: ../../cpp/src/ray/example/example.cc