MOD: assembly clean (#20557)

* MOD: assembly clean

clean code

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update AssemblyLink.cpp

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/Mod/Assembly/App/AssemblyLink.cpp

@@ -491,8 +491,6 @@ JointGroup* AssemblyLink::ensureJointGroup()
         jGroup = new JointGroup();
         getDocument()->addObject(jGroup, tr("Joints").toStdString().c_str());
 
-        // we want to add jgroup at the start, so we don't use
-        // addObject(jGroup);
         std::vector<DocumentObject*> grp = Group.getValues();
         grp.insert(grp.begin(), jGroup);
         Group.setValues(grp);