Fixed: Replace SvnCheckout in Gradle (OFBIZ-12868)

Updates the documentation for pullAllPluginsSource.sh and pullPluginSource.sh

Uses
git switch -C "$branch"
instead of
git switch "$branch"
in both scripts

There is something weird with pullPluginSource.sh. It works perfectly on Windows
using git-bash, but in Ubuntu 20.04 it does not add but replaces plugins.
I tested using current last Git version in both OS
(respectively 2.43.0.windows.1 and 2.43.0). It's a minor issue as it does not
block the CI so I'll review that later...

Author: JacquesLeRoux

README.adoc

@@ -695,29 +695,35 @@ If you need username and password to access the custom repository:
 Download an official plugin from source control and place it in the plugins directory.
 It's able to handle branches switches
 
+[IMPORTANT]
+====
+You need to use the last Git version, at least a 2.26 version
+====
+
+
 MS Windows: `pullPluginSource example` +
 Unix-like OS: `./pullPluginSource.sh example`
 
 [[pull-all-official-plugins-from-source-control]]
 === Pull all official plugins from source control
 
-Download all officially supported plugins from source control (currently
-git) and place them in /plugins.
+Download all officially supported plugins from source control and place them in /plugins.
 It's able to handle branches switches
 
-WARNING! This task deletes the /plugins directory and replaces it with the
-official plugins.
+[CAUTION]
+====
+ This task deletes the /plugins directory and replaces it with the official plugins.
+====
+
+[IMPORTANT]
+====
+You need to use the last Git version, at least a 2.26 version
+====
 
 MS Windows: `pullAllPluginsSource` +
 Unix-like OS: `./pullAllPluginsSource.sh`
 
 
-This task makes it easy to download and develop officially supported plugins. It
-is mostly used by developers or individuals working on the trunk branch. We do
-not recommend using this task on releases of OFBiz, instead consider using the
-"pullPlugin" task to get the correct version of a plugin compatible with your
-release.
-
 [[install-a-plugin]]
 === Install a plugin
 

pullAllPluginsSource.sh

@@ -33,7 +33,7 @@ cd plugins
 # By default the clone branch is trunk
 if [ ! $branch = trunk ]
     then
-        git switch "$branch"
+        git switch -C "$branch"
 fi
 
 # remove .git, in this case it's big useless information

pullPluginSource.sh

@@ -49,6 +49,6 @@ rm temp.txt
 # By default the clone branch is trunk
 if [ ! "$branch" = trunk ]
     then
-        git switch "$branch"
+        git switch -C "$branch"
 fi
 cd ..