Docs for more fine-grained control (using [conf]) for build parallelization

reference/conanfile/tools/cmake.rst

@@ -317,3 +317,9 @@ conf
 - ``tools.microsoft.msbuild:verbosity`` will accept one of ``"Quiet", "Minimal", "Normal", "Detailed", "Diagnostic"`` to be passed
   to the ``CMake.build()`` command, when a Visual Studio generator (MSBuild build system) is being used for CMake. It is passed as
   an argument to the underlying build system via the call ``cmake --build . --config Release -- /verbosity:Diagnostic``
+
+- ``tools.ninja:jobs`` argument for the ``--jobs`` parameter when running Ninja generator. (overrides
+  the general ``tools.build:processes``).
+
+- ``tools.microsoft.msbuild:max_cpu_count`` argument for the ``/m`` (``/maxCpuCount``) when running
+  ``MSBuild`` (overrides the general ``tools.build:processes``).

reference/conanfile/tools/gnu.rst

@@ -156,6 +156,11 @@ consistent conventions and strategy, however they are currently completely
 independent from each other. Thus, you can use this toolchain without using the
 ``MakeGenerator``.
 
+conf
+++++
+
+- ``tools.gnu.make:jobs``: argument for the ``--jobs`` parameter when running ``make`` 
+  (overrides the general ``tools.build:processes``).
 
 Using the toolchain in developer flow
 +++++++++++++++++++++++++++++++++++++

reference/conanfile/tools/meson.rst

@@ -187,3 +187,9 @@ test()
     def test(self):
 
 Runs project's tests. Equivalent to running :command:`meson test -v -C .` in the build folder..
+
+conf
+++++
+
+- ``tools.ninja:jobs`` argument for the ``--jobs`` parameter when running Ninja. (overrides
+  the general ``tools.build:processes``).

reference/config_files/global_conf.rst

@@ -31,10 +31,25 @@ have priority over globally defined ones in *global.conf*, and can be defined as
 
     [conf]
     tools.microsoft.msbuild:verbosity=Diagnostic
-
+    tools.microsoft.msbuild:max_cpu_count=20
+    tools.build:processes=10
+    tools.ninja:jobs=30
+    tools.gnu.make:jobs=40
 
 Existing configurations:
 
-- ``tools.microsoft.msbuild:verbosity`` allows defining a value from ``"Quiet", "Minimal", "Normal", "Detailed", "Diagnostic"`` for build using the
-  MSBuild system, it could be with the ``tools.microsoft.MSBuild`` or with the ``tools.cmake.CMake`` helpers.
+- ``tools.microsoft.msbuild:verbosity`` allows defining a value from ``"Quiet", "Minimal", "Normal",
+  "Detailed", "Diagnostic"`` for build using the
+  MSBuild system, it could be with the ``tools.microsoft.MSBuild`` or with the ``tools.cmake.CMake``
+  helpers.
+
+- ``tools.microsoft.msbuild:max_cpu_count`` argument for the ``/m`` (``/maxCpuCount``) when running
+  ``MSBuild`` standalone or via CMake (overrides the general ``tools.build:processes``).
+
+- ``tools.build:processes``: number of processes to use for every build-helper.
+
+- ``tools.ninja:jobs`` argument for the ``--jobs`` parameter when running Ninja generator via CMake
+  or Meson. (overrides the general ``tools.build:processes``). 
 
+- ``tools.gnu.make:jobs``: argument for the ``--jobs`` parameter when running ``make`` 
+  (overrides the general ``tools.build:processes``).