add a link to datasheet for fs.com GPON-SFP-ONT-MAC-I SKU 133619

I cannot find a datasheet for GPON-ONU-34-20BI on fs.com.

Author: bugfood

_ont/ont-fs-com-gpon-onu-stick-with-mac.md

@@ -540,6 +540,7 @@ The FS stick stores the content of the emulated EEPROM in U-Boot env variables t
 - [General setting of lantiq](https://forum.fibra.click/d/23881-ma5671a-e-vodafone-25-gbps/64)
 - [Usage GPON module SFP in Spain](https://forum.mikrotik.com/viewtopic.php?t=116364&start=300)
 - [SourcePhotonics SPS-34-24T-HP-TDFO Datasheet](https://www.sourcephotonics.com/wp-content/uploads/2017/08/DS-8085-02_SPS-34-24T-HP-TDFO.pdf)
+- [FS.com GPON-SFP-ONT-MAC-I SKU 133619 Datasheet](https://resource.fs.com/mall/resource/gpon-sfp-ont-mac-i-datasheet.pdf)
 - [FS.com GPON-ONU-34-20BI Configuration Guide](https://resource.fs.com/mall/doc/20230831180515egrzs6.pdf)
 
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