Corrected annotation for Debugger::exportVar() method.

[dmromanov]

Debugger::exportVar() in fact accepts any variables, not only strings. See annotations for _export() function in the same class.

[codecov]

Codecov Report

Merging #12306 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #12306      +/-   ##
============================================
- Coverage     91.94%   91.93%   -0.01%     
  Complexity    13552    13552              
============================================
  Files           467      467              
  Lines         34823    34823              
============================================
- Hits          32019    32016       -3     
- Misses         2804     2807       +3

Impacted Files	Coverage Δ	Complexity Δ
src/Error/Debugger.php	94.55% <ø> (ø)	135 <0> (ø)	⬇️
src/Cache/CacheRegistry.php	95.83% <0%> (-4.17%)	11% <0%> (ø)
src/Cache/Engine/FileEngine.php	89.01% <0%> (-1.1%)	73% <0%> (ø)

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