Merge topic 'doc-find_package-typical-usage'

4b55d56259 Help: Start find_package() docs with a new "Typical Usage" section

Acked-by: Kitware Robot <[email protected]>
Merge-request: !9567

Help/command/find_package.rst

@@ -21,6 +21,30 @@ Find a package (usually provided by something external to the project),
 and load its package-specific details.  Calls to this command can also
 be intercepted by :ref:`dependency providers <dependency_providers>`.
 
+Typical Usage
+^^^^^^^^^^^^^
+
+Most calls to ``find_package()`` typically have the following form:
+
+.. parsed-literal::
+
+  find_package(<PackageName> [<version>] [REQUIRED] [COMPONENTS <components>...])
+
+The ``<PackageName>`` is the only mandatory argument.  The ``<version>`` is
+often omitted, and ``REQUIRED`` should be given if the project cannot be
+configured successfully without the package.  Some more complicated packages
+support components which can be selected with the ``COMPONENTS`` keyword, but
+most packages don't have that level of complexity.
+
+The above is a reduced form of the `basic signature`_.  Where possible,
+projects should find packages using this form.  This reduces complexity and
+maximizes the ways in which the package can be found or provided.
+
+Understanding the `basic signature`_ should be enough for general usage of
+``find_package()``.  Project maintainers who intend to provide a config
+package should understand the bigger picture, as explained in
+:ref:`Full Signature` and all subsequent sections on this page.
+
 Search Modes
 ^^^^^^^^^^^^
 
@@ -86,12 +110,6 @@ first before falling back to Module mode.  The basic signature can also be
 forced to use only Module mode with a ``MODULE`` keyword.  If the
 `full signature`_ is used, the command only searches in Config mode.
 
-Where possible, user code should generally look for packages using the
-`basic signature`_, since that allows the package to be found with any mode.
-Project maintainers wishing to provide a config package should understand
-the bigger picture, as explained in :ref:`Full Signature` and all subsequent
-sections on this page.
-
 .. _`basic signature`:
 
 Basic Signature