docs(programming_guide): turned off smartquotes

Sphinx would "smartly" format e.g. double dashes into typographically correct entities,
i.e. a long dash unicode character.

This doesnt always work well for our docs were sometimes a double dash could be a python
argument, which when copied would no longer work.

docs/conf_common.py

@@ -252,6 +252,8 @@ extensions += ['sphinx_copybutton',
 # Use wavedrompy as backend, insted of wavedrom-cli
 render_using_wavedrompy = True
 
+smartquotes = False
+
 # link roles config
 github_repo = 'espressif/esp-idf'