The the document is over 25 pages long, some of it in untranslated Latin, and can be found online at various sites. Clear summaries can be found here and here.
Now I see that LifeSite has launched a PETITION where others can add their names to the signatories. I also see that, despite the Correctio's framer's original intention to voluntarily exclude bishops and cardinals, that Rene Henry Gracida, Bishop Emeritus of the Diocese of Corpus Christi, has sent in his name to be added to the original list of signatories. Others will probably follow suit.
Just one comment. The whole idea of sending a "correction" to the Pope sounds radical. Some have called it 'epochal.' Yet it may be important to bear in mind that the document does not accuse Pope Francis of formal heresy. Rather, it argues that the Pope has allowed heterodox opinions to proliferate by his silence when asked for clarification (as by the four cardinals last year), by his prolix and confusing declarations in interview, and his appointment to positions of influence within the Church men who publicly dissent from Catholic teaching on the sacraments. It is, in short, a filial cri de cœur directed to the Holy Father asking for him to raise the torch of truth and illumine the darkness amid the sea of benighted confusion in which so many feel as if they are drowning.
Please pray for His Holiness, Pope Francis, for the whole Church, and for all affected by the confusion abroad.