Fix warnings in documentation rst files.

[spazm]

Fixes the current warnings in docs/*/rst files

• The "inline strong" and "Bullet list" warnings both affect the rendered output.
• The "Title underline" warning does not affect the rendered output.

docs/components/ory/technical.rst:23: WARNING: Bullet list ends without a blank line; unexpected unindent.
docs/components/ory/usage.rst:14: WARNING: Inline strong start-string without end-string.
docs/components/ory/usage.rst:33: WARNING: Inline strong start-string without end-string.
docs/components/ory/usage.rst:56: WARNING: Title underline too short.

Identities and Providers
~~~~~~~~~~~~~~~~~~~~
docs/components/ory/usage.rst:56: WARNING: Title underline too short.

Identities and Providers
~~~~~~~~~~~~~~~~~~~~

[spazm]

If this PR is useful, I'd appreciate if you could add a label of "hacktoberfest-accepted".