RFR: Remove mention of /integrate from the start of the pre-integration message.

[Jorn Vernee]

Hi,

In response to some of the discussion on: https://github.com/openjdk/jdk/pull/26 I suggest changing the pre-integration
comment to remove the mention of `/integrate` at the start, where it reads:

    type `/integrate` in a new comment to proceed

Since `/integrate` is also mentioned at the end of the same message (with a clearer description of what it does
[1](https://github.com/openjdk/skara/blob/master/bots/pr/src/main/java/org/openjdk/skara/bots/pr/CheckRun.java#L603-L610)),
this is an attempt to encourage users to read till the end of the message before typing `/integrate`.

Thanks,
Jorn

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Commit messages:
 - Remove mention of /integrate from the start of the integration message.

Changes: https://git.openjdk.java.net/skara/pull/801/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=801&range=00
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/skara/pull/801.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/801/head:pull/801

PR: https://git.openjdk.java.net/skara/pull/801