docs: correct log output to indicate success for install_foxx when run from CMakeLists.txt

Author: JoshuaSBrown

CMakeLists.txt

@@ -241,8 +241,8 @@ if( INSTALL_FOXX )
                                 RESULT_VARIABLE _res)
                 if (NOT \${_res} EQUAL \"0\")
                     message( FATAL_ERROR \"out: \${_out} install_foxx failed: \${_err}\")
-		else()
-                    message( \"\${_out} install_foxx failed: \${_err}\")
+                else()
+                    message( \"\${_out} install_foxx completed: \${_err}\")
                 endif()"
          )
 endif()