Fixed some typos. [skip ci]

Author: jlesage

README.md

@@ -67,7 +67,7 @@ docker run [-d] \
 ```
 | Parameter | Description |
 |-----------|-------------|
-| -d        | Run the container in background.  If not set, the container runs in foreground. |
+| -d        | Run the container in the background.  If not set, the container runs in the foreground. |
 | -e        | Pass an environment variable to the container.  See the [Environment Variables](#environment-variables) section for more details. |
 | -v        | Set a volume mapping (allows to share a folder/file between the host and the container).  See the [Data Volumes](#data-volumes) section for more details. |
 | -p        | Set a network port mapping (exposes an internal container port to the host).  See the [Ports](#ports) section for more details. |
@@ -85,9 +85,9 @@ of this parameter has the format `<VARIABLE_NAME>=<VALUE>`.
 |`SUP_GROUP_IDS`| Comma-separated list of supplementary group IDs of the application. | (unset) |
 |`UMASK`| Mask that controls how file permissions are set for newly created files. The value of the mask is in octal notation.  By default, this variable is not set and the default umask of `022` is used, meaning that newly created files are readable by everyone, but only writable by the owner. See the following online umask calculator: http://wintelguy.com/umask-calc.pl | (unset) |
 |`TZ`| [TimeZone] of the container.  Timezone can also be set by mapping `/etc/localtime` between the host and the container. | `Etc/UTC` |
-|`KEEP_APP_RUNNING`| When set to `1`, the application will be automatically restarted if it crashes or if user quits it. | `0` |
+|`KEEP_APP_RUNNING`| When set to `1`, the application will be automatically restarted if it crashes or if a user quits it. | `0` |
 |`APP_NICENESS`| Priority at which the application should run.  A niceness value of -20 is the highest priority and 19 is the lowest priority.  By default, niceness is not set, meaning that the default niceness of 0 is used.  **NOTE**: A negative niceness (priority increase) requires additional permissions.  In this case, the container should be run with the docker option `--cap-add=SYS_NICE`. | (unset) |
-|`CLEAN_TMP_DIR`| When set to `1`, all files in the `/tmp` directory are delete during the container startup. | `1` |
+|`CLEAN_TMP_DIR`| When set to `1`, all files in the `/tmp` directory are deleted during the container startup. | `1` |
 
 ### Data Volumes
 
@@ -180,7 +180,7 @@ docker rm nginx-proxy-manager
 
 ### Synology
 
-For owners of a Synology NAS, the following steps can be use to update a
+For owners of a Synology NAS, the following steps can be used to update a
 container image.
 
   1.  Open the *Docker* application.