Added license notes to 3 books and added type of book (pdf) for one (#11479)

* Updated free-programming-books-langs.md

book 1 - A Complete Guide to Standard C++ Algorithms
license: CC-BY-NC-SA
found "This work may be distributed and/or modified under the conditions of the CC-BY-NC-SA license" 
on page 4/116


book 2 - C++ GUI Programming with Qt 3
license: OPl
found "This material may only be distributed subject to the terms and conditions set forth in the
Open Publication License, v1.0 or later"
on page 4/464


book 3 - C++ Notes for Professionals
license: CC BY-SA
found " the content is written by the beautiful people at Stack Overflow.
Text content is released under Creative Commons BY-SA"
on page 19/708

* fixed recommended changes

* Apply suggestions from code review

Co-authored-by: Eric Hellman <eric@hellman.net>

---------

Co-authored-by: Eric Hellman <eric@hellman.net>

books/free-programming-books-langs.md

@@ -512,15 +512,15 @@ Books on general-purpose programming that don't focus on a specific language are
 
 ### <a id="cpp"></a>C++
 
-* [A Complete Guide to Standard C++ Algorithms](https://github.com/HappyCerberus/book-cpp-algorithms) - Šimon Tóth (PDF, LaTeX) *(:construction: in process)*
+* [A Complete Guide to Standard C++ Algorithms](https://github.com/HappyCerberus/book-cpp-algorithms) - Šimon Tóth (PDF, LaTeX) (CC BY-NC-SA) *(:construction: in process)*
 * [An Introduction to the USA Computing Olympiad, C++ Edition](https://darrenyao.com/usacobook/cpp.pdf) - Darren Yao (PDF)
 * [C++ Annotations](https://fbb-git.gitlab.io/cppannotations/) - Frank B. Brokken (HTML, PDF)
 * [C++ Coding Standard](https://possibility.com/Cpp/CppCodingStandard.html) - Todd Hoff (HTML, PDF)
 * [C++ Core Guidelines](https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md) - `edt.:` Bjarne Stroustrup, Herb Sutter
 * [C++ For Programmers](https://tfetimes.com/wp-content/uploads/2015/04/c-for-c-programmers.pdf) - JT Kalnay (PDF)
 * [C++ GUI Programming With Qt 3](https://ptgmedia.pearsoncmg.com/images/0131240722/downloads/blanchette_book.pdf) - Jasmin Blanchette, Mark Summerfield (PDF)
-* [C++ Language](http://www.cplusplus.com/doc/tutorial/)
+* [C++ Language](http://www.cplusplus.com/doc/tutorial/) (HTML)
-* [C++ Notes for Professionals](https://goalkicker.com/CPlusPlusBook) - Compiled from StackOverflow Documentation (PDF)
+* [C++ Notes for Professionals](https://goalkicker.com/CPlusPlusBook) - Compiled from StackOverflow Documentation (PDF) (CC BY-SA)
 * [C++ Programming](https://en.wikibooks.org/wiki/C%2B%2B_Programming) - Panic, et al.
 * [C++ Programming: Code patterns design](https://en.wikibooks.org/wiki/C%2B%2B_Programming/Code/Design_Patterns) - WikiBooks (HTML)
 * [C++ Succinctly, Syncfusion](https://www.syncfusion.com/resources/techportal/ebooks/cplusplus) (PDF, Kindle) (email address *requested*, not required)