Добавление документации по трёхмерным векторам и исправления

docs/vector3/reset-eng.md

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+# Resetting the state of a 2D vector
+
+These functions set all coordinates of 2D vectors to 0.
+
+Function for **BgcVector3FP32**:
+
+```c
+inline void bgc_vector3_reset_fp32(BgcVector3FP32* vector);
+```
+
+Function for **BgcVector3FP64**:
+
+```c
+inline void bgc_vector3_reset_fp64(BgcVector3FP64* vector);
+```
+
+Each of these functions is equivalent to the following lines of code:
+
+```c
+vector->x1 = 0;
+vector->x2 = 0;
+vector->x3 = 0;
+```
+
+You should not pass invalid pointers to these functions. 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_reset_fp32(&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)