fix "tenth" (of a CPU) unit to "hundredth", from sylabs 212

[JasonYangShadow]

This fixes a subpart of https://github.com/apptainer/apptainer-userdocs/issues/239 by merging

• https://github.com/sylabs/singularity-userdocs/pull/212 which fixed
• https://github.com/sylabs/singularity-userdocs/issues/211

The original PR description was:

Fixes incorrect unit (in prose) for description of CPU limit (--cpu option) from "tenth" to "hundredth".