Various grammar and clarity inaccuracies

https://github.com/AppFlowy-IO/AppFlowy-Docs/blob/25b257ed20e86ededcf0337049fc07d7247d6e34/essential-documentation/contribute-to-appflowy/appflowy-mentorship-program/mentorship-2022/mentee-projects/importers.md?plain=1#L121

***Sentence clarity***
Inaccurate: Now the problem we can see here is as discussed before...
Accurate: Now, as discussed before, the problem we see here is..

***Extra space***
Inaccurate: which is the root` .`
Accurate: which is the root.

***Consistent capitalization***
instead of `Appflowy` test which is the root
instead of `AppFlowy` test which is the root

***Subject-verb agreement***
all the file name are starting from AppFlowy Test
all the file name`s` start with AppFlowy Test

***Missing apostrophe***
it wont be able find the image file
it `won't` be able find the image file

***Past tense***
this issue was solve by only passing.
this issue was `solved` by only passing.

***Possessive***
it name
`its` name