component/bt: change pictures from .pdf to .png

diff --git a/examples/bluetooth/gatt_server_service_table/tutorial/image/Table-like data structure representing the Heart Rate Service.pdf b/examples/bluetooth/gatt_server_service_table/tutorial/image/Table-like data structure representing the Heart Rate Service.pdf
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diff --git a/examples/bluetooth/gattc_multi_connect/tutorial/image/ESP32 GATT Multi-connect Client Application Profiles.pdf b/examples/bluetooth/gattc_multi_connect/tutorial/image/ESP32 GATT Multi-connect Client Application Profiles.pdf
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diff --git a/examples/bluetooth/gattc_multi_connect/tutorial/image/Multi-connection GATT Client Flowchart.pdf b/examples/bluetooth/gattc_multi_connect/tutorial/image/Multi-connection GATT Client Flowchart.pdf
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diff --git a/examples/bluetooth/gattc_multi_connect/tutorial/image/Multi-connection GATT Client Flowchart.png b/examples/bluetooth/gattc_multi_connect/tutorial/image/Multi-connection GATT Client Flowchart.png
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