Update 1_7_Variables.ipynb typo in bold markdown

Typo in bold markdown

python/1_7_Variables.ipynb

@@ -65,7 +65,7 @@
     "Python is a **strongly typed** language and **dynamically typed** language.\n",
     "\n",
     "This means:\n",
-    "* ** dynamically typed**: variables do not declare a static type (as in Java int a = 2;). Variables have no type themselves, they are just names that hold a reference to some object. The type of the variable is changed dynamically when you change the type of the assigned data object. \n",
+    "* **dynamically typed**: variables do not declare a static type (as in Java int a = 2;). Variables have no type themselves, they are just names that hold a reference to some object. The type of the variable is changed dynamically when you change the type of the assigned data object. \n",
     "* **strongly typed**: the interpreter tracks variable types. There is no implicit type conversion. This means that all the type variables should be converted manually, preventing from unexpected behaviour. "
    ]
   },