Fix typo in HTC link (#8487)

Fix HTC link

Author: fbagci

configs/htc/README.md

@@ -1,6 +1,6 @@
 # HTC
 
-> [Hybrid Task Cascade for Instance Segmentation](ttps://arxiv.org/abs/1901.07518)
+> [Hybrid Task Cascade for Instance Segmentation](https://arxiv.org/abs/1901.07518)
 
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