containerize: fix typo in documentation (#22331)
Before this fix, `spack containerize` complains that `centos/7` is invalid (should have been `centos:7`)
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		| @@ -227,7 +227,7 @@ following ``spack.yaml``: | |||||||
|  |  | ||||||
|      container: |      container: | ||||||
|        images: |        images: | ||||||
|          os: centos/7 |          os: centos:7 | ||||||
|          spack: 0.15.4 |          spack: 0.15.4 | ||||||
|  |  | ||||||
| uses ``spack/centos7:0.15.4``  and ``centos:7`` for the stages where the | uses ``spack/centos7:0.15.4``  and ``centos:7`` for the stages where the | ||||||
|   | |||||||
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	 Wouter Deconinck
					Wouter Deconinck