Fix typo

app.py

@@ -6,7 +6,7 @@ st.title('Fitting simple models with JAX')
 st.header('A quadratric regression example')
 
 st.markdown('**This is a simple text** to specify the goal of this simple data app\n.')
-st.latex('h(\boldsymbol x, \boldsymbol w)= \sum_{k=1}^{K}\boldsymbol w_{k} \phi_{k}(\boldsymbol x)'
+st.latex('h(\boldsymbol x, \boldsymbol w)= \sum_{k=1}^{K}\boldsymbol w_{k} \phi_{k}(\boldsymbol x)')
 
 number_of_observations = st.sidebar.slider('Number of observations', min_value=50, max_value=150, value=50)
 noise_standard_deviation = st.sidebar.slider('Standard deviation of the noise', min_value = 0.0, max_value=2.0, value=0.25)