[foreign-memaccess+abi] RFR: Fix typos

[Per Minborg]

This PR proposes to fix a fairly large number of typos.

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Commit messages:
 - Fix typos

Changes: https://git.openjdk.org/panama-foreign/pull/893/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-foreign&pr=893&range=00
  Stats: 17 lines in 12 files changed: 0 ins; 0 del; 17 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/893.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign.git pull/893/head:pull/893

PR: https://git.openjdk.org/panama-foreign/pull/893