Backports release 1.13

[dkarrasch]

• Fix forgotten conj(alpha) in her2k documentation #1480
• Fix 3-arg dot for empty arrays #1485
• Fixed typo in matmul.jl #1492

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.92%. Comparing base (7e11b5e) to head (99da7a5).

Files with missing lines	Patch %	Lines
src/triangular.jl	0.00%	4 Missing ⚠️
src/hessenberg.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.13    #1495   +/-   ##
=============================================
  Coverage         93.92%   93.92%           
=============================================
  Files                34       34           
  Lines             15933    15935    +2     
=============================================
+ Hits              14965    14967    +2     
  Misses              968      968           

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