[PATCH] Fix PR gdb/21606: SYMBOL_FUNCTIONS_DOMAIN misspelled in documentation

[Sergio Durigan Junior]

On Tuesday, June 20 2017, I wrote:

> Both Python and Guile documentations misspelled
> SYMBOL_FUNCTIONS_DOMAIN, writing SYMBOL_FUNCTION_DOMAIN instead.  This
> obvious commit fixes it.

Forgot to put [obvious/commit] in the subject line, but I've already
pushed to the master branch:

eb83230b4d5c0129174937846ded9eaa9f78ff28

Thanks,

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Sergio
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