Добавление документации по трёхмерным векторам и исправления

docs/vector3/set-values-eng.md

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+# Setting the coordinates of a three-dimensional vector
+
+You can set the coordinates of vectors either directly or using functions. The functions for setting coordinate values allow you to do this in one line.
+
+Function for **BgcVector3FP32**:
+
+```c
+inline void bgc_vector3_set_values_fp32(const float x1, const float x2, const float x3, BgcVector3FP32* to);
+```
+
+Function for **BgcVector3FP32**:
+
+```c
+inline void bgc_vector3_set_values_fp64(const double x1, const double x2, const double x3, BgcVector3FP64* to);
+```
+
+Each of these functions is equivalent to the following lines of code:
+
+```c
+to->x1 = x1;
+to->x2 = x2;
+to->x3 = x3;
+```
+
+Invalid pointers should not be passed in the **to** parameter. The NULL (0) value is also considered invalid.
+
+Example of use:
+
+```c
+#include <stdio.h>
+#include <basic-geometry.h>
+
+int main()
+{
+    BgcVector3FP32 my_vector;
+
+    bgc_vector3_set_values_fp32(-2, 7, 10, &my_vector);
+
+    printf("x1 = %f, x2 = %f, x3 = %f\n", my_vector.x1, my_vector.x2, my_vector.x3);
+
+    return 0;
+}
+```
+
+[Documentation](../intro-eng.md) / [2D vectors](../vector3-eng.md)