Improve wording of loplugin:unoany warnings

...which apparently caused confusion occasionally, cf.
<https://gerrit.libreoffice.org/#/c/58687/5> "Unit test for
0853b05b".

Change-Id: I32f1137bcbb86ffa04bc1a6a58fc93ef69cb3022
Reviewed-on: https://gerrit.libreoffice.org/63874
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

compilerplugins/clang/test/unoany.cxx

@@ -19,8 +19,8 @@ int main()
     css::uno::Any b;
     a = b;
     a = getAny();
-    a = css::uno::makeAny(true); // expected-error {{unnecessary copy, rather use <<= operator [loplugin:unoany]}}
-    a = css::uno::Any(true); // expected-error {{unnecessary copy, rather use <<= operator [loplugin:unoany]}}
+    a = css::uno::makeAny(true); // expected-error {{unnecessary copy, rather use <<= operator directly with the 'makeAny' argument [loplugin:unoany]}}
+    a = css::uno::Any(true); // expected-error {{unnecessary copy, rather use <<= operator directly with the 'Any' constructor argument [loplugin:unoany]}}
 }
 
 

compilerplugins/clang/unoany.cxx

@@ -48,7 +48,8 @@ bool UnoAny::VisitCXXOperatorCallExpr(CXXOperatorCallExpr const * expr)
                     Namespace("uno").Namespace("star").Namespace("sun").Namespace("com").GlobalNamespace()) {
                     report(
                             DiagnosticsEngine::Warning,
-                            "unnecessary copy, rather use <<= operator",
+                            ("unnecessary copy, rather use <<= operator directly with the 'makeAny'"
+                             " argument"),
                             expr->getOperatorLoc())
                       << expr->getSourceRange();
                     return true;
@@ -59,7 +60,8 @@ bool UnoAny::VisitCXXOperatorCallExpr(CXXOperatorCallExpr const * expr)
             //expr->getArg(1)->dump();
             report(
                     DiagnosticsEngine::Warning,
-                    "unnecessary copy, rather use <<= operator",
+                    ("unnecessary copy, rather use <<= operator directly with the 'Any' constructor"
+                     " argument"),
                     expr->getOperatorLoc())
               << expr->getSourceRange();
             return true;