RFR: 7903936: Update variable names in build.sh documentation [v2]

[Oleksii Sylichenko]

> Changed variable name `CURL_OPTS` to `CURL_OPTIONS` in the documentation block "Some noteworthy control variables" in `build.sh`. 
> 
> `CURL_OPTIONS` is used in the `download_using_curl()` function in `build-support/build-common.sh`.

Oleksii Sylichenko has updated the pull request incrementally with one additional commit since the last revision:

  Update the second year of make/build.sh to 2025

-------------

Changes:
  - all: https://git.openjdk.org/jtreg/pull/238/files
  - new: https://git.openjdk.org/jtreg/pull/238/files/c3fb91a9..14692275

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jtreg&pr=238&range=01
 - incr: https://webrevs.openjdk.org/?repo=jtreg&pr=238&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jtreg/pull/238.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/238/head:pull/238

PR: https://git.openjdk.org/jtreg/pull/238