The model name is incorrect

[Patchino]

File: /release-7.1/garbage-collection-overview.md
Google Percolator 模型 should be "[Google Precolator]"

[qiancai]

Hi @Patchino, according to https://research.google/pubs/large-scale-incremental-processing-using-distributed-transactions-and-notifications/, "Percolator" is correct. Might I know where you found the occurrence of "Precolator"?