[foreign-memaccess+abi] RFR: Fix misc typos in FFM API javadoc [v2]

[Maurizio Cimadamore]

> This PR fixes a bunch of issues found when running grammar code inspection in IntelliJ.

Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:

  Revert bad fix

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Changes:
  - all: https://git.openjdk.org/panama-foreign/pull/873/files
  - new: https://git.openjdk.org/panama-foreign/pull/873/files/c23d0991..358728d0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=panama-foreign&pr=873&range=01
 - incr: https://webrevs.openjdk.org/?repo=panama-foreign&pr=873&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/873.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign.git pull/873/head:pull/873

PR: https://git.openjdk.org/panama-foreign/pull/873