Fix test_double_quoted_strings_are_strings eval true

* Learned to use .is_a?(String) to check if
  variable is a string.

[#48449053]
Fix test_single_quoted_strings_are_also_strings
to evaluate true

* Reminder that '' is the same as ""
  to indicate a string.

[#48449053]
Fix test_use_single_quotes_to_create_
string_with_double_quotes to eval true

* Reminder of how to use regluar ex-
  pressions inside a string when have
  quotes inside string quotes.

[#48449053]
Fix test_use_double_quotes_to_create_
strings_with_single_quotes to eval true

* Reminder to use regular expressions to
  escape single quote inside string's
  double quote.

[#48449053]
Fix test_use_backslash_for_those_hard_cases

* Learned that in comparing strings the use
  of \ to escape a single or double quote
  is not used in the comparison.

[#48449053]
Fix test_use_flexible_quoting_to_
handle_really_hard_cases

* Learned about flexible quotes.

[#48449053]
Fix test_flexible_quotes_can_handle_
multiple_lines to evaluate true

* Learned how to handle multiple
  lines in a flexible quote.

[#48449053]
Fix test_here_documents_can_also_
handle_multiple_lines to eval true

* Learned that docs and flexible
  quotes handle multiple lines
  differently.

[#48449053]
Fix test_plus_will_concatenate_two_strings

* Reminder of how to concatenate
  two strings.

[#48449053]
Fix test_plus_concatenation_will_leave_
the_original_strings_unmodified to
evaluate true

* Orginal variables that were strings
  did not change.

[#48449053]
Fix test += to add strings together

* Practiced using += to combine strings.

[#48449053]
Fix test will += change orig string

* Practiced that using += will not
  change the orginal string.

[#48449053]
Fix test of usign shovel modifier

* Shovel modifier works on strings
  like concatination. Shovel
  modifier is <<

[#48449053]
Fix test of shovel modifying org var

* Learned that using the shovel
  modifier << can change a string's
  original contents when it is
  assigned to another string.

[#48449053]
Fix test if escape chars count in string

* Learned that the escape character
  \ does not count as a character
  in string.size.

[#48449053]
Fix test single quote string w/escape

* Learned that when use single quotes
  for a string all the characters in-
  side is are counted in string.size
  including the escape char \.

* Whereas in "" only the escape char
  \ is not counted in string.size.

[#48449053]
Fix test '' sometimes interpret escape char

* Learned string = '\\\'' has string.sixe
  of 2 and is equal to "\\'".

[#48449053]
Fix test "" strings interpolate var

* Practice string interpolation.

[#48449053]
Fix '' string doesn't do string interpolation

* Learned that with '' the string inter-
  polation #{value} is equal to \#{value}

[#48449053]
Fix test ruby expression interpolated

* Learned that any ruby expression
  can be interpolated.

[#48449053]