Исправление структуры документации

docs/vector2/swap-eng.md

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+# Swapping
+
+The exchange functions allow two vectors of the same type to exchange coordinate values.
+
+Function for **BgcVector2FP32**:
+
+```c
+    inline void bgc_vector2_swap_fp32(BgcVector2FP32* vector1, BgcVector2FP32* vector2);
+```
+
+Function for **BgcVector2FP32**:
+
+```c
+    inline void bgc_vector2_swap_fp64(BgcVector2FP64* vector1, BgcVector2FP64* vector2);
+```
+
+You should not pass invalid pointers to these functions. The value NULL (0) is also considered invalid.
+
+Vector **vector1** after calling this function will have the coordinate values that vector **vector2** had before calling the function.
+And vector **vector2** after calling this function will have the same coordinate values that vector **vector1** had before calling the function.
+
+Example of use:
+
+```c
+    #include <stdio.h>
+    #include <basic-geometry.h>
+
+    int main()
+    {
+        BgcVector2FP32 my_vector1, my_vector2;
+
+        bgc_vector2_set_values_fp32(-2, 7, &my_vector1);
+        bgc_vector2_set_values_fp32(10, -1, &my_vector2);
+
+        bgc_vector2_swap_fp32(&my_vector1, &my_vector2);
+
+        printf("Vector #1: x1 = %f, x2 = %f\n", my_vector1.x1, my_vector1.x2);
+        printf("Vector #2: x1 = %f, x2 = %f\n", my_vector2.x1, my_vector2.x2);
+
+        return 0;
+    }
+```
+
+[Documentation](../intro-eng.md) / [2D vectors](../vector2-eng.md)