RFR: JDK-8288232: Address typos in jar man page

[Lance Andersen]

Hi

Please review this update to the jar man page which removes the "=" for the non GNU style options

Best
Lance

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Commit messages:
 - add space for -i option
 - add space between option
 - address typos in jar man page

Changes: https://git.openjdk.org/jdk/pull/10947/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10947&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288232
  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/10947.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10947/head:pull/10947

PR: https://git.openjdk.org/jdk/pull/10947