Punctuation changes in documentation (#4866)

Author: maiki

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -126,9 +126,9 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
    on another (https) port.
 - `PORT_TO_REDIRECT`: **80**: Port used when `REDIRECT_OTHER_PORT` is true.
 - `ENABLE_LETSENCRYPT`: **false**: If enabled you must set `DOMAIN` to valid internet facing domain (ensure DNS is set and port 80 is accessible by letsencrypt validation server).
-   By using Lets Encrypt **you must consent** to their [terms of service](https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf)
-- `LETSENCRYPT_ACCEPTTOS`: **false**: This is an explicit check that you accept the terms of service for Let's Encrypt
-- `LETSENCRYPT_DIRECTORY`: **https**: Directory that Letsencrypt will use to cache information such as certs and private keys
+   By using Lets Encrypt **you must consent** to their [terms of service](https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf).
+- `LETSENCRYPT_ACCEPTTOS`: **false**: This is an explicit check that you accept the terms of service for Let's Encrypt.
+- `LETSENCRYPT_DIRECTORY`: **https**: Directory that Letsencrypt will use to cache information such as certs and private keys.
 - `LETSENCRYPT_EMAIL`: **[email protected]**: Email used by Letsencrypt to notify about problems with issued certificates. (No default)
 
 ## Database (`database`)
@@ -190,8 +190,8 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
    for reverse authentication.
 - `ENABLE_CAPTCHA`: **false**: Enable this to use captcha validation for registration.
 - `CAPTCHA_TYPE`: **image**: \[image, recaptcha\]
-- `RECAPTCHA_SECRET`: **""**: Go to https://www.google.com/recaptcha/admin to get a secret for recaptcha 
-- `RECAPTCHA_SITEKEY`: **""**: Go to https://www.google.com/recaptcha/admin to get a sitekey for recaptcha
+- `RECAPTCHA_SECRET`: **""**: Go to https://www.google.com/recaptcha/admin to get a secret for recaptcha.
+- `RECAPTCHA_SITEKEY`: **""**: Go to https://www.google.com/recaptcha/admin to get a sitekey for recaptcha.
 - `DEFAULT_ENABLE_DEPENDENCIES`: **true** Enable this to have dependencies enabled by default.
 
 ## Webhook (`webhook`)
@@ -217,8 +217,8 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
    This is common on linux systems.
    - Note that enabling sendmail will ignore all other `mailer` settings except `ENABLED`,
      `FROM` and `SENDMAIL_PATH`.
-- `SENDMAIL_PATH`: **sendmail**: The location of sendmail on the operating system. (can be
-   command or full path)
+- `SENDMAIL_PATH`: **sendmail**: The location of sendmail on the operating system (can be
+   command or full path).
 
 ## Cache (`cache`)
 
@@ -242,7 +242,7 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
    `http://cn.gravatar.com/avatar/`.
 - `DISABLE_GRAVATAR`: **false**: Enable this to use local avatars only.
 - `ENABLE_FEDERATED_AVATAR`: **false**: Enable support for federated avatars (see
-   http://www.libravatar.org)
+   [http://www.libravatar.org](http://www.libravatar.org)).
 - `AVATAR_UPLOAD_PATH`: **data/avatars**: Path to store local and cached files.
 
 ## Attachment (`attachment`)
@@ -304,7 +304,7 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
 ## API (`api`)
 
 - `ENABLE_SWAGGER_ENDPOINT`: **true**: Enables /api/swagger, /api/v1/swagger etc. endpoints. True or false; default is true. 
-- `MAX_RESPONSE_ITEMS`: **50**: Max number of items in a page
+- `MAX_RESPONSE_ITEMS`: **50**: Max number of items in a page.
 
 ## i18n (`i18n`)