docs(Import API): update function description, overwrite real meaning

[michael-hoffman-26]

SUMMARY

updating the description of model/import function.
the overwrite argument determine whether overwrite the model or not.
before it was written that the overwrite arg determine weather overwrite the database which isn't what actually happened

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #18882 (5a46cf1) into master (0edb979) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18882      +/-   ##
==========================================
- Coverage   66.36%   66.34%   -0.03%     
==========================================
  Files        1621     1621              
  Lines       63058    63057       -1     
  Branches     6382     6382              
==========================================
- Hits        41851    41837      -14     
- Misses      19547    19560      +13     
  Partials     1660     1660              

Flag	Coverage Δ
hive	52.28% <ø> (ø)
mysql	?
postgres	81.60% <ø> (ø)
presto	52.12% <ø> (ø)
python	81.99% <ø> (-0.05%)	⬇️
sqlite	81.29% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/charts/api.py	85.93% <ø> (ø)
superset/dashboards/api.py	92.54% <ø> (ø)
superset/common/utils/dataframe_utils.py	85.71% <0.00%> (-7.15%)	⬇️
superset/db_engine_specs/mysql.py	93.97% <0.00%> (-3.62%)	⬇️
superset/models/core.py	88.19% <0.00%> (-0.73%)	⬇️
superset/views/core.py	77.06% <0.00%> (-0.45%)	⬇️
...board/components/nativeFilters/FilterBar/index.tsx	66.94% <0.00%> (-0.28%)	⬇️

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[amitmiran137]

LGTM