Clarify Cmaketoolchain user presets documentation (#2591)

reference/conanfile/tools/cmake/cmaketoolchain.rst

@@ -50,7 +50,7 @@ Or fully instantiated in the ``generate()`` method:
             tc.generate()
 
 
-This will generate the following files after a ``conan install`` (or when building the package
+This will generate the following files after a call to ``conan install`` (or when building the package
 in the cache) with the information provided in the ``generate()`` method as well as information
 translated from the current ``settings``:
 
@@ -64,20 +64,21 @@ translated from the current ``settings``:
   - Deactivation of rpaths in OSX
 
 - *CMakePresets.json*: The toolchain also generates a ``CMakePresets.json`` standard file, check the documentation
-  `here <https://cmake.org/cmake/help/latest/manual/cmake-presets.7.html>`_. It is currently using the version "3" of
+  `here <https://cmake.org/cmake/help/latest/manual/cmake-presets.7.html>`_. It is currently using version "3" of
   the JSON schema.
-  Conan creates a ``default`` configure preset with the information:
+  Conan creates a ``default`` configure preset with the following information:
 
-     - The ``generator`` to be used.
-     - The path to the ``conan_toolchain.cmake``
+     - The CMake ``generator`` to be used.
+     - The path to the generated ``conan_toolchain.cmake`` file.
      - Some cache variables corresponding to the specified settings cannot work if specified in the toolchain.
-     - The ``CMAKE_BUILD_TYPE`` variable when using a single-configuration generators.
-
-- *CMakeUserPresets.json*:  If you declare a ``layout()`` in the recipe and your ``CMakeLists.txt`` file is found at
-  the ``conanfile.source_folder`` folder, a ``CMakeUserPresets.json`` file will be generated (if doesn't exist already) including
-  automatically the ``CMakePresets.json`` (at the ``conanfile.generators_folder``) to allow your IDE (Visual Studio,
-  Visual Studio Code, CLion...) or ``cmake`` tool to locate the ``CMakePresets.json``. The version schema of the generated
-  ``CMakeUserPresets.json`` is "4" and requires CMake >= 3.23.
+     - The ``CMAKE_BUILD_TYPE`` variable when using single-configuration generators.
+
+- *CMakeUserPresets.json*:  If you declare a ``layout()`` in the recipe and your ``CMakeLists.txt`` file is found in
+  the ``conanfile.source_folder`` folder, Conan will place a ``CMakeUserPresets.json`` to include the ``CMakePresets.json`` 
+  generated with the above specification. This will allow your IDE to allow your IDE (Visual Studio, Visual Studio Code, CLion...) 
+  or ``cmake`` tool to locate the  Conan-generated``CMakePresets.json``. The version schema of the generated ``CMakeUserPresets.json`` is 
+  "4" and requires CMake >= 3.23.
+  Note: Conan will skip the generation if it already exists and was not previously generated by Conan.
 
 
 - *conanvcvars.bat*: In some cases, the Visual Studio environment needs to be defined correctly for building,