Documenting gaze position calibration features.

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+Gaze position calibrators
+=========================
+
+ArGaze provides ready-to-use gaze position calibrator algorithms.
+
+Here are JSON samples to include the chosen module inside [ArFrame configuration](../advanced_topics/gaze_position_calibration.md) *gaze_position_calibrator* entry.
+
+## Linear regression
+
+```json
+"LinearRegression": {
+	"coefficients": [
+        [
+            0.901167941442693,
+            0.0345129853595345
+        ],
+        [
+            0.11551395622739168,
+            0.9315744785596141
+        ]
+    ],
+    "intercept": [
+        65.43372920399452,
+        -52.23141937917768
+    ]
+}
+```
+
+[See in code reference](../../../argaze.md/#argaze.GazeAnalysis.LinearRegression.GazePositionCalibrator)
+