(fix): added details of postgres and mysql in docs

[sahmad11]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

I have added examples of how to run create_db_report on Postgres and mysql databases by using SQLAlchemy in addition to the already added SQLite example to the documentation.

Checklist:

• My code follows the style guidelines of this project
• I have already squashed the commits and make the commit message conform to the project standard.
• I have already marked the commit with "BREAKING CHANGE" or "Fixes #" if needed.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Merging #880 (a91d211) into develop (e3a7d22) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #880   +/-   ##
========================================
  Coverage    56.06%   56.07%           
========================================
  Files          314      314           
  Lines        20451    20451           
========================================
+ Hits         11465    11467    +2     
+ Misses        8986     8984    -2     

Impacted Files	Coverage Δ
dataprep/eda/distribution/render.py	91.06% <0.00%> (+0.10%)	⬆️
dataprep/eda/distribution/compute/overview.py	94.05% <0.00%> (+0.54%)	⬆️

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