RFR: 8279877: Document IDEA IDE setup in docs/ide.md [v2]

[Daniel Jelinski]

> Currently the information about using IDEA can only be found on mailing lists.
> 
> Additionally fixed the documentation for Visual Studio; the target `ide-project` does not exist.

Daniel Jelinski has updated the pull request incrementally with one additional commit since the last revision:

  Improved wording

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7044/files
  - new: https://git.openjdk.java.net/jdk/pull/7044/files/1f4e99ca..b6d81300

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7044&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7044&range=00-01

  Stats: 11 lines in 2 files changed: 1 ins; 1 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7044.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7044/head:pull/7044

PR: https://git.openjdk.java.net/jdk/pull/7044