Fix storage guide links

[benjaminhuo]

Signed-off-by: Benjamin benjamin@yunify.com

What this PR does / why we need it:
Fix link errors in storage guide

Checklist

• Documentation added

[codecov-io]

Codecov Report

Merging #3094 (9f4ea70) into master (48b6583) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3094      +/-   ##
==========================================
+ Coverage   62.78%   62.80%   +0.01%     
==========================================
  Files         186      186              
  Lines       15949    15949              
==========================================
+ Hits        10014    10016       +2     
+ Misses       5009     5004       -5     
- Partials      926      929       +3     

Impacted Files	Coverage Δ
pkg/logql/vector.go	59.09% <0.00%> (-22.73%)	⬇️
pkg/logql/evaluator.go	89.87% <0.00%> (ø)
pkg/promtail/targets/file/filetarget.go	64.33% <0.00%> (+0.69%)	⬆️
pkg/canary/comparator/comparator.go	78.18% <0.00%> (+1.81%)	⬆️
pkg/querier/queryrange/downstreamer.go	97.64% <0.00%> (+2.35%)	⬆️

[sandeepsukhani]

Thanks for the PR. LGTM!