message: change MergeButton example tag to is
diff: @@ -33,33 +33,33 @@ const MergeButton = ({numCommits, onClick, primary}) => {
  <Details className="details-reset d-flex float-right">
  {({toggle}) => (
  <React.Fragment>
  - <Button tag="summary" {...buttonSchemeProps} onClick={toggle} style={borderStyles}>
  + <Button is="summary" {...buttonSchemeProps} onClick={toggle} style={borderStyles}>
  <div className="d-inline-block v-align-middle" style={arrowStyles} />
  </Button>
  <Block position="absolute" width={300} mt={1} style={{zIndex: 99999}}>
  <CaretBox caret="top-left">
  <ul className="list-style-none p-0 m-0">
  <li className="border-bottom py-2 pl-4 pr-2">
  - <Text tag="p" m={0} fontSize={1} fontWeight="bold">
  + <Text is="p" m={0} fontSize={1} fontWeight="bold">
  Create a merge commit
  </Text>
  - <Text tag="p" m={0} fontSize={0}>
  + <Text is="p" m={0} fontSize={0}>
  All commits from this branch will be added to the base branch via a merge commit.
  </Text>
  </li>
  <li className="border-bottom py-2 pl-4 pr-2">
  - <Text tag="p" m={0} fontSize={1} fontWeight="bold">
  + <Text is="p" m={0} fontSize={1} fontWeight="bold">
  Squash and merge
  </Text>
  - <Text tag="p" m={0} fontSize={0}>
  + <Text is="p" m={0} fontSize={0}>
  The {commits} from this branch will be combined into one commit in the base branch.
  </Text>
  </li>
  <li className="py-2 pl-4 pr-2">
  - <Text tag="p" m={0} fontSize={1} fontWeight="bold">
  + <Text is="p" m={0} fontSize={1} fontWeight="bold">
  Rebase and merge
  </Text>
  - <Text tag="p" fontSize={0} m={0}>
  + <Text is="p" fontSize={0} m={0}>
  The {commits} from this branch will be rebased and added to the base branch
  </Text>
  </li>
  