Improve context for platform_tool_requires (#4162)

* Add explanation for platform_tool_requires context

* Add same warning to replace_tool_requires

Author: AbrilRBS

reference/config_files/profiles.rst

@@ -445,6 +445,12 @@ Same usage as the `replace_requires` section but in this case for `tool_requires
 
 In this case, whatever version of ``cmake`` declared in recipes, will be replaced by the reference `cmake/3.25.2`.
 
+..  note::
+
+   * This section should be added to the profile whose context is the one that requires the tool, i.e., if the
+     tool is required in the host context, then it should be added to the host profile, so that the requirement
+     itself can be replaced.
+
 
 .. _reference_config_files_profiles_platform_requires:
 
@@ -540,9 +546,13 @@ declaration:
     Build requirements
         cmake/3.24.2 - Platform
 
-Note that if the ``platform_tool_requires`` declared **does not make a strict match** with the ``tool_requires`` one (version or
-version range), then Conan will try to bring them remotely or locally as usual.
+..  note::
 
+   * If the ``platform_tool_requires`` declared **does not make a strict match** with the ``tool_requires`` one (version or
+     version range), then Conan will try to bring them remotely or locally as usual.
+   * This section should be added to the profile whose context is the one that requires the tool, i.e., if the
+     tool is required in the host context, then it should be added to the host profile, so that the requirement
+     itself can be replaced by the platform one.
 
 .. _reference_config_files_profiles_rendering: