Adam Spiers 7934e6f405 Clarify that translation strings are extracted via source inspection
Make it clearer why the function argument to _() etc. has to be a
string, by explicitly mentioning source inspection, as suggested by
Doug:

https://review.opendev.org/#/c/664670/1/doc/source/user/guidelines.rst@164

Change-Id: I87212a709b9e474238f4a4feca5ed806cfb4bd49
2019-06-12 12:14:41 +01:00
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