Merge bitcoin/bitcoin#27840: contrib: docs fix --import-keys flag on verify.py

ceb0168 contrib: docs fix --import-keys flag on verify.py (Bufo)

Pull request description:

  When trying to run `./contrib/verify-binaries/verify.py` with the --import-keys flag, I figured that there was a little mistake in the docs. It stated that the `--import-keys` flag has to be provided after the arguments, instead of before. It was stated correctly in the rest of the README, but not in this particular case.

  I tested this on macOS 13.4 as well as on Debian 10.

ACKs for top commit:
  willcl-ark:
    ACK ceb0168
  Tguntenaar:
    I ran into this together with bufo24, therefore ACK [ceb0168](bitcoin/bitcoin@ceb0168)
  MarcoFalke:
    lgtm ACK ceb0168

Tree-SHA512: a8acdcc7f92c43e731ae8b6c86dba8df06481e9765118b5b2b63caf3cdf0dd34333e48c848602003082f49d971d7127373aaf9ff7a8572d41285869efa06b0f4

Author: fanquake

contrib/verify-binaries/README.md

@@ -17,7 +17,7 @@ must obtain that key for your local GPG installation.
 You can obtain these keys by
   - through a browser using a key server (e.g. keyserver.ubuntu.com),
   - manually using the `gpg --keyserver <url> --recv-keys <key>` command, or
-  - you can run the packaged `verify.py ... --import-keys` script to
+  - you can run the packaged `verify.py --import-keys ...` script to
     have it automatically retrieve unrecognized keys.
 
 #### Usage