[jdk18] RFR: JDK-8278516: Typos in snippet for java.compiler

[Jonathan Gibbons]

Please review a trivial update to replace some instances of `toURI` with `toUri` that were accidentally introduced when converting some code to use snippets.

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Commit messages:
 - JDK-8278516: Typos in snippet for java.compiler

Changes: https://git.openjdk.java.net/jdk18/pull/2/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18&pr=2&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278516
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk18/pull/2.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18 pull/2/head:pull/2

PR: https://git.openjdk.java.net/jdk18/pull/2