Fixed about_symbols.rb to pass tests

Learned about:
* symbols and that they can be compared,
* identical symbols being a single internal object,
* method names becoming symbols.

[#65851754]
Fixed about_symbols.rb to pass tests

Learned about:
* constants that become symbols,
* and that symbols can be made from strings,
* even from strings with spaces.
* building symbols with interpolation,
* and that #to_s is called on interpolated symbols.

[#65851754]
Fixed about_symbols.rb to pass tests

Learned that:
* symbols are not strings,
* neither they respond to string methods,
* symbols can't be concatenated,
* but the can be dynamically created.

[#65851754]
Merge pull request #8 from mkreyman/65851754_about_symbols_master

about symbols master

[Delivers #65851754]