Add runtime_deploy docs (#3789)

* add runtime_deploy

* minor changes

Author: czoido

reference/commands/install.rst

@@ -118,13 +118,15 @@ like collecting licenses, generating reports, deploying binaries to the system,
     $ conan install . --deployer=full_deploy
 
 
-There are 2 built-in deployers:
+There are 3 built-in deployers:
 
 - ``full_deploy`` does a complete copy of the dependencies binaries in the local folder, with a minimal folder
   structure to avoid conflicts between files and artifacts of different packages
 - ``direct_deploy`` does a copy of only the immediate direct dependencies, but does not include the transitive
   dependencies.
-
+- ``runtime_deploy`` deploys all the shared libraries and the executables of the
+  dependencies (like ``.so``, ``.dll``, or ``.dylib`` files) into a flat directory
+  structure. (Available since Conan 2.5.0)
 
 Some generators might have the capability of redefining the target "package folder". That means that if some other
 generator like ``CMakeDeps`` is used that is pointing to the packages, it will be pointing to the local deployed

whatsnew.rst

@@ -57,7 +57,7 @@ Conan 2 has redesigned the CLI for better consistency, removing ambiguities, and
 
 New deployers
 -------------
-Conan 2 implements “deployers”, which can be called in the command line as ``conan install …. --deployer=mydeploy``, typically to perform copy operations from the Conan cache to user folders. Such deployers can be built-in (“full_deploy” and “direct_deploy” are provided so far), or user-defined, which can be shared and managed with ``conan config install``. Deployers run before generators, and they can change the target folders. For example, if the ``--deployer=full_deploy`` deployer runs before ``CMakeDeps``, the files generated by ``CMakeDeps`` will point to the local copy in the user folder done by the ``full_deploy`` deployer, and not to the Conan cache.
+Conan 2 implements “deployers”, which can be called in the command line as ``conan install …. --deployer=mydeploy``, typically to perform copy operations from the Conan cache to user folders. Such deployers can be built-in (“full_deploy”, “direct_deploy” and "runtime_deploy" are provided so far), or user-defined, which can be shared and managed with ``conan config install``. Deployers run before generators, and they can change the target folders. For example, if the ``--deployer=full_deploy`` deployer runs before ``CMakeDeps``, the files generated by ``CMakeDeps`` will point to the local copy in the user folder done by the ``full_deploy`` deployer, and not to the Conan cache.
 
 Deployers can be multi-configuration. Running ``conan install . --deployer=full_deploy`` repeatedly for different profiles, can achieve a fully self-contained project, including all the artifacts, binaries, and build files that is completely independent of Conan and no longer require Conan at all to build.