RFR: Small typos in Javadocs

[kabutz]

Ignore if you like, but I noticed that "it" was probably supposed to be "its"

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Commit messages:
 - Small typos in Javadocs

Changes: https://git.openjdk.java.net/loom/pull/186/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=186&range=00
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/loom/pull/186.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/186/head:pull/186

PR: https://git.openjdk.java.net/loom/pull/186