Fix select_tag generating tag when set to false.

Fixes https://github.com/rails/rails/issues/17701.
Update grammar in Getting Started Guide [ci skip]
Merge pull request #17704 from fgo/patch-13

Update grammar in Getting Started Guide [ci skip]
make it possible to access fixtures excluded by a `default_scope`.

Prior to this patch you'd end up with an error like:

```
ActiveRecord::RecordNotFound: Couldn't find <Model> with 'id'=<id> [WHERE (<default_scope condition>)]
```
Merge pull request #17702 from tgxworld/fix_select_tag_include_blank_false

Fix select_tag generating tag when set to false.
Move 'the' outside of SQLite and Bundler link text [ci skip]
Merge pull request #17705 from fgo/patch-14

Move 'the' outside of SQLite and Bundler link text [ci skip]
ConnectionAdapter#substitute_at is technically public API...

We can't change the signature without a deprecation cycle.
[ci skip] correct example output and filename in pg guide
Merge pull request #17712 from y-yagi/correct_postgres_guide

[ci skip] correct example output and filename in pg guide