Issue #4111: Mention that HTML::Scrubber has adaptions

try to improve the markup by marking commands and file names

Kernel/cpan-lib/README.md

@@ -4,10 +4,10 @@ All of these modules are implemented in pure Perl.
 License information of the bundled modules can be found in the
 [COPYING-Third-Party](../../COPYING-Third-Party) file.
 
-The original list of the bundled distributions is maintained in the module Kernel::System::Environment. Please keep
-that list up to date when upgrading or adding distributions. The list from Kernel::System::Environment is also used by
-bin/otobo.CheckModules.pl. That command can be used to generate a cpanfile for the bundled modules.
-The generated cpanfile can then be used for updating Kernel/cpan-lib.
+The original list of the bundled distributions is maintained in the module `Kernel::System::Environment. Please keep
+that list up to date when upgrading or adding distributions. The list from `Kernel::System::Environment` is also used by
+the command *bin/otobo.CheckModules.pl*. That command can be used to generate a cpanfile for the bundled modules.
+The generated cpanfile can then be used for updating *Kernel/cpan-lib*.
 But that task is not trivial. So here is an exemplar workflow:
 
 ### Preparation for both quick update and complete regeneration
@@ -63,10 +63,11 @@ The reason why specific files are not included in the bundle is not always evide
     find . \( -name "*.pl" \) -delete                      # just because this is the tradition
     find . -type d -empty -delete                                     # empty dirs are not needed, usually dirs with documentation only
 
-### Add files that do no originate from CPAN.
+### Add files that do no originate from CPAN or are modified by OTOBO
 
-    cp -r Devel/REPL local/lib/perl5/Devel         # the plugins Devel::REPL::Plugin::OTOBO is not on CPAN
-    cp -r Plack local/lib/perl5/Plack              # the Plack plugins are not on CPAN
+    cp -r Devel/REPL local/lib/perl5/Devel                # the plugins Devel::REPL::Plugin::OTOBO is not on CPAN
+    cp -r Plack local/lib/perl5/Plack                     # the Plack plugins are not on CPAN
+    cp -r HTML/Scrubber.pm local/lib/perl5/HTML/Scrubber  # with OTOBO specific modifications
 
 ### Install missing modules
 
@@ -93,7 +94,7 @@ Clean up again when module were installed
 
 ### Finalize
 
-Copy new or changed files into Kernel/cpan-lib. Remove no longer needed files. Make sure that
+Copy new or changed files into *Kernel/cpan-lib*. Remove no longer needed files. Make sure that
 the changes are submitted to git.
 
     diff -r . local/lib/perl5/ | grep -v cpanfile | grep -v README.md      # the goal is to see only 'local'