fix typo and remove repetition about page queries having access to pa… (#7304)
fix typo and remove repetition about page queries having access to pa… (#7304)

* fix typo and remove repetition about page queries having access to pageContext

* Revert change

* attempt to clarify differences

* modify list of differences between page queries and static queries

gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,mingaldrichgan/gatsby,0x80/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,0x80/gatsby,mingaldrichgan/gatsby,0x80/gatsby,mingaldrichgan/gatsby