Correct birthYear from 1971 in first and last images

[semionov-is]

The first image shows birthYear: 1971, but it should be birthYear: 1970.

java-programming/data/part-5/3-primitive-and-reference-variables.md

Line 481 in 28541c8

<img src="../img/drawings/part5.3-first-1-tm.png"/>

And the last image also shows birthYear: 1971, but it should be birthYear: 1972.

java-programming/data/part-5/3-primitive-and-reference-variables.md

Line 520 in 28541c8

<img src="../img/drawings/part5.3-first-5-tm.png"/>