[ru] fix typo in Learn/Server-side/Django/Models

[arahmaninov]

Description

Fixed typo in the str func. Field name was

field_name

while field name in the class is

my_field_name

Motivation

I believe this type can mislead the readers

Additional details

Related issues and pull requests

[github-actions]

Preview URLs

• /ru/docs/Learn/Server-side/Django/Models

Flaws (87)

URL: /ru/docs/Learn/Server-side/Django/Models
Title: Django учебник Часть 3: Использование моделей
Flaw count: 87

• macros:
  • /ru/docs/Learn/CSS/Building_blocks/Cascade_layers does not exist but fell back to /en-US/docs/Learn/CSS/Building_blocks/Cascade_layers
  • /ru/docs/Learn/CSS/Building_blocks/Organizing does not exist but fell back to /en-US/docs/Learn/CSS/Building_blocks/Organizing
  • /ru/docs/Learn/CSS/Building_blocks/Creating_fancy_letterheaded_paper does not exist but fell back to /en-US/docs/Learn/CSS/Building_blocks/Creating_fancy_letterheaded_paper
  • /ru/docs/Learn/CSS/Building_blocks/A_cool_looking_box does not exist but fell back to /en-US/docs/Learn/CSS/Building_blocks/A_cool_looking_box
  • /ru/docs/Learn/CSS/CSS_layout/Media_queries does not exist but fell back to /en-US/docs/Learn/CSS/CSS_layout/Media_queries
  • and 82 more flaws omitted

[leon-win]

I turned on Python syntax highlighting and russified the example.
Also added the missing import)

[leon-win]

Merged!
@arahmaninov thank you!