Fix Longhorn docs version linked in PV expansion

[itorres]

Problem:

The docs in troubleshooting about expanding PV/Volume Size link the Longhorn v1.3.2 docs.

https://docs.harvesterhci.io/v1.7/troubleshooting/monitoring/#expand-pvvolume-size

Online volume expansion is supported since Longhorn v1.4.0 which Harvester uses since Harvester v1.2.0 but users of recent versions reading about volume expansion are lead to think that they have top stop workloads using Longhorn PVCs.

Solution:

Update the linked Longhorn docs to match the Longhorn version used by that Harvester version (extracted from Chart.yaml).

Related Issue(s):

Issue harvester/harvester#10223

Test plan:

Additional documentation or context

We can check the versions used by each versioned harvester docs with a script parsing Harvester's charts.

$ for version in $(ls versioned_docs | awk -F'-' '{print $2 ".0"}'); do echo $version;  git -C ../harvester show ${version}:deploy/charts/harvester/Chart.yaml | grep -B1 charts.longhorn; done
<n;  git -C ../harvester show ${version}:deploy/charts/harvester/Chart.yaml | grep -B1 charts.longhorn; done
v0.3.0
    version: 1.2.2
    repository: https://charts.longhorn.io
v1.0.0
    version: 1.2.3
    repository: https://charts.longhorn.io
v1.1.0
    version: 1.3.2
    repository: https://charts.longhorn.io
v1.2.0
    version: 1.4.3
    repository: https://charts.longhorn.io
v1.3.0
    version: 1.6.0
    repository: https://charts.longhorn.io
v1.4.0
    version: 1.7.2
    repository: https://charts.longhorn.io
v1.5.0
    version: 1.8.1
    repository: https://charts.longhorn.io
v1.6.0
    version: 1.9.1
    repository: https://charts.longhorn.io
v1.7.0
    version: 1.10.1
    repository: https://charts.longhorn.io

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