Fix make misspell hanging on internal/tools

[KSerrania]

Description:

When running make to run tests, the misspell target is run on the internal/tools directory (since #2131).
As there are no .md nor .yaml files in this directory, the ALL_DOC variable (defined as ALL_DOC := $(shell find . \( -name "*.md" -o -name "*.yaml" \) -type f | sort) is empty.
Therefore, the misspell target runs misspell -error without any argument, causing misspell to read stdin, hanging. The only way to make make not hang is to send EOF (eg. with echo -n | make).

I suspect that this doesn't affect the CI as it automatically sends EOF to stdin.

This PR fixes makes the misspell -error by making the misspell command conditionally run, only if ALL_DOC is defined and not empty.

Link to tracking Issue: n/a

Testing: Run make before and after the fix. Check that the misspell step doesn't hang after the fix.

Documentation: n/a

[codecov]

Codecov Report

Merging #2230 (98f6013) into master (511cdaa) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2230   +/-   ##
=======================================
  Coverage   91.98%   91.98%           
=======================================
  Files         271      271           
  Lines       15664    15656    -8     
=======================================
- Hits        14408    14401    -7     
  Misses        854      854           
+ Partials      402      401    -1     

Impacted Files	Coverage Δ
internal/data/bytesid.go	76.92% <0.00%> (-4.03%)	⬇️

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[mx-psi]

I tested that it correctly solves the problem on my machine