doc: title case all story names

for the sake of consistency

Author: urish

src/potentiometer-element.stories.ts

@@ -3,10 +3,10 @@ import { action } from '@storybook/addon-actions';
 import { html } from 'lit-html';
 import './potentiometer-element';
 
-storiesOf('potentiometer', module)
+storiesOf('Potentiometer', module)
   .addParameters({ component: 'wokwi-potentiometer' })
   .add(
-    'potentiometer',
+    'Potentiometer',
     () =>
       html`
         <wokwi-potentiometer

src/pushbutton-element.stories.ts

@@ -3,7 +3,7 @@ import { action } from '@storybook/addon-actions';
 import { html } from 'lit-html';
 import './pushbutton-element';
 
-storiesOf('pushbutton', module)
+storiesOf('Pushbutton', module)
   .addParameters({ component: 'wokwi-pushbutton' })
   .add(
     'Red',

src/resistor-element.stories.ts

@@ -4,7 +4,7 @@ import { withKnobs, number } from '@storybook/addon-knobs';
 
 import './resistor-element';
 
-storiesOf('resistor', module)
+storiesOf('Resistor', module)
   .addParameters({ component: 'wokwi-resistor' })
   .addDecorator(withKnobs())
   .add('1Ω', () => html`<wokwi-resistor value="${number('R', 1)}"></wokwi-resistor>`)