Standardise ast Node names and parse multiple doc comments as a single docstring

[FollowTheProcess]

Summary

[codecov]

Codecov Report

❌ Patch coverage is 88.23529% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.8%. Comparing base (82446df) to head (cf0932c).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/syntax/parser/parser.go	88.2%	2 Missing and 2 partials ⚠️
internal/syntax/ast/expression.go	80.0%	2 Missing ⚠️
internal/syntax/ast/statement.go	75.0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #183     +/-   ##
=======================================
- Coverage   77.9%   77.8%   -0.1%     
=======================================
  Files         27      27             
  Lines       1978    1990     +12     
=======================================
+ Hits        1541    1549      +8     
- Misses       336     338      +2     
- Partials     101     103      +2     

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