fix: remove font weight

Author: ankit-tailor

example/storybook/stories/components/basic/View/Basic.tsx

@@ -7,7 +7,7 @@ export const Example = () => {
         A component library for the{' '}
         <Heading color="emerald.400">React Ecosystem</Heading>
       </Heading>
-      <Text pt="3" fontWeight="md">
+      <Text pt="3">
         NativeBase is a simple, modular and accessible component library that
         gives you building blocks to build you React applications.
       </Text>