Update solid.md (#330)

Убрал вопрос про множественное наследование

Author: iatsdotfatr

frontend/middle-1/solid.md

@@ -70,7 +70,6 @@ Learn how to design complex systems according to engineering heuristics gathered
 * What is the goal of the ISP?
 * How the ISP helps to solve the problem of classes that implement non-cohesive interfaces?
 * How can violation of the ISP principle also lead to violation of the LSP?
-* Should we avoid multiple inheritance if interfaces are several abstract classes?
 * Can the ISP also be useful for a project written in FP style?
 
 #### Resources
@@ -125,4 +124,4 @@ Learn how to design complex systems according to engineering heuristics gathered
 * [OTA SOLID (интерактивный ресурс)](https://ota-solid.now.sh)
 * [SOLID Principles with Uncle Bob - Robert C. Martin](https://www.hanselminutes.com/145/solid-principles-with-uncle-bob-robert-c-martin)
 * [The Principles of OOD](http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod) (contains links to original papers about SOLID, those papers are definitely recommended to be read)
-* Adaptive Code: Agile coding with design patterns and SOLID principles. Second Edition (Gary McLean Hall, Part III, Chapters 7-11)
+* Adaptive Code: Agile coding with design patterns and SOLID principles. Second Edition (Gary McLean Hall, Part III, Chapters 7-11)