Correct docs images

readme.md

@@ -471,8 +471,6 @@ depicts the bare-metal BeagleBone Black Edition
 in action. In this bare-metal operation mode, there is
 no running `*nix` OS on the BBB, no keyboard,
 no mouse, no monitor, no debug interface and no emulator.
-See also the corresponding [pdf image](./images/bare_metal_bbb.pdf).
-
 
 The microcontroller on the board is cyclically performing
 one of the [benchmarks](./ref_app/src/app/benchmark)

ref_app/src/app/benchmark/readme.md

@@ -52,8 +52,8 @@ Differing performance classes are compared for
 the $8$-bit MICROCHIP(R) AVR controller of the Arduino
 and the $32$-bit ARM(R) 8 controller
 of the BeagleBone Black Edition, Rev. C.
-See the corresponging
-[pdf image](https://github.com/ckormanyos/real-time-cpp/blob/update_docs/ref_app/src/app/benchmark/images/app_benchmark_pi_agm.pdf)
+
+![](https://github.com/ckormanyos/real-time-cpp/blob/master/ref_app/src/app/benchmark/images/app_benchmark_pi_agm.pdf)
 
 The $\pi$ calculation requires approximately
 $470~\text{ms}$ and $1.5~\text{ms}$,