fix link + typo

Author: massonal

_cmake/Advanced usage.md

@@ -6,7 +6,7 @@ Regarding the latter, an [`insight()`](./Functions-reference#insights) can be us
 Below is the logic structure of the simplest example, the Blink sketch.
 The following sections may refer to it to illustrate their points.
 
-![Blink logic structure](../img/logicstructure.gv.svg)
+![Blink logic structure](./img/logicstructure.gv.svg)
 
 
 # Adding new settings to the build

_cmake/Introduction to CMake.md

@@ -78,7 +78,7 @@ Here are some key points about the structure of a `CMakeLists.txt` (Also read [t
 
 - CMake [User Interaction Guide](https://cmake.org/cmake/help/v3.21/guide/user-interaction/index.html)
 - [CMake tutorial](https://cmake.org/cmake/help/latest/guide/tutorial/index.html)
-- [Convertinh existing systems to CMake](https://cmake.org/cmake/help/book/mastering-cmake/chapter/Converting%20Existing%20Systems%20To%20CMake.html)
+- [Converting existing systems to CMake](https://cmake.org/cmake/help/book/mastering-cmake/chapter/Converting%20Existing%20Systems%20To%20CMake.html)
 
 # Third-party