Fix phpdoc directory `Cache`.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[codecov[bot]]

Codecov Report

Merging #352 (7f03511) into master (acea86a) will not change coverage. The diff coverage is 75.00%.

@@            Coverage Diff            @@
##             master     #352   +/-   ##
=========================================
  Coverage     90.15%   90.15%           
  Complexity     1200     1200           
=========================================
  Files            61       61           
  Lines          2671     2671           
=========================================
  Hits           2408     2408           
  Misses          263      263           

Impacted Files	Coverage Δ
src/Cache/QueryCache.php	84.00% <66.66%> (ø)
src/Cache/SchemaCache.php	81.81% <100.00%> (ø)

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