RFR: 6859: Correction in JMC welcome page [v3]

[Suchita Chaturvedi]

> Updated some titles for update sites and made it specific to Open source.

Suchita Chaturvedi has updated the pull request incrementally with one additional commit since the last revision:

  Implemented review comments

-------------

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/197/files
  - new: https://git.openjdk.java.net/jmc/pull/197/files/56bcab95..7c7eed56

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=197&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=197&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jmc/pull/197.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/197/head:pull/197

PR: https://git.openjdk.java.net/jmc/pull/197