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

Open essential-documentation/contribute-to-appflowy/appflowy-mentorship-program/mentorship-2022/mentee-projects/importers.md at the linked section around line 121 and review each listed grammar, spacing, capitalization, agreement, tense, apostrophe, and possessive correction. Done means the documented sentences match the accurate examples and no listed inaccuracies remain.

Written by the indexing model from the issue text.