From Tomas Kyjovsky:

5.5.2.1.
p1:
When Red Hat Single Sign-On boots up, one and only one instance of each different provider factory. — missing verb, needs clarification from Bill Burke

p3:
the "Server Installation and Configuration Guide" link points to the guide for 7.1-Beta

p5:
instead of hard coded it ---> instead of hard-coding it

5.5.4
Of course, this user will have zero permissions to do anything and will be read only. You can though view the user on its account page after you login.
--->
Of course, this user will have zero permissions to do anything and will be read-only. The user will only be able to view the account page after login.
5.6.

p2:
There’s also callback methods --> There are also callback methods

5.6.1
p1:
allow you to to point a provider

p2:
string type --> String type
will be labed --> will be labeled

p4 — bad formatting:
<code class="literal">org.keycloak.common.util.EnvUtil.replace()`method. With this method any string that has `${}</code>
--->
<code class="literal">org.keycloak.common.util.EnvUtil.replace()</code> method. With this method any string that has <code class="literal">${}</code>

p6:
This logic, is of course, is really inefficient