Fix broken links - #1526

Running Vale across on the following files affected by this PR:

- changelog/2026-08-07.mdx
- observability/msb-metrics.mdx

Attempting to initialize Vale linter...
No customer vale configuration detected. Using Mintlify's default configuration.
Attempting to run Vale spellcheck...
Vale spellcheck completed successfully.

docs/changelog/2026-08-07.mdx:
	- 11:1      Did you really mean 'microsandbox'?
	- 11:72     Did you really mean 'Magnus'?
	- 11:291    Did you really mean 'allowlists'?
	- 11:440    Did you really mean 'Resque'?
	- 24:212    Did you really mean 'resizable'?
	- 35:317    Did you really mean 'loopback'?
	- 35:339    Did you really mean 'multicast'?
	- 35:471    Did you really mean 'nameserver'?
	- 49:271    Did you really mean 'argv'?
	- 61:207    Did you really mean 'APICv'?
	- 61:253    Did you really mean 'writeback'?
	- 61:327    Did you really mean 'SDKs'?
	- 61:366    Did you really mean 'writeback'?
	- 61:567    Did you really mean 'APICv'?
	- 65:224    Did you really mean 'mkdir'?
	- 71:71     Did you really mean 'SDKs'?
	- 72:85     Did you really mean 'accessors'?
	- 77:34     Did you really mean 'enums'?
	- 77:277    Did you really mean 'getters'?
	- 89:83     Did you really mean 'virtiofs'?
	- 93:169    Did you really mean 'upsert'?

docs/observability/msb-metrics.mdx:
	- 4:57      Did you really mean 'microsandbox'?
	- 10:50     Did you really mean 'microsandbox'?
	- 67:20     Did you really mean 'msb'?
	- 101:18    Did you really mean 'walkthroughs'?
	- 104:16    Did you really mean 'Grafana'?
	- 105:20    Did you really mean 'Grafana'?
	- 117:13    Did you really mean 'Datadog'?
	- 132:7     Did you really mean 'datapoint'?
	- 161:37    Did you really mean 'Grafana'?


Found 30 suggested changes across 2 files in 462.85ms