bunch of minor tweaks (#138)

Author: GodloveD

pages/docs/user-docs/.action-exec.md.swp

@@ -26,6 +26,11 @@ SUPPORT_URL="http://www.debian.org/support"
 BUG_REPORT_URL="https://bugs.debian.org/"
 $ 
 ```
+### Printing the OS release for a running instance:
+Use the `instance://<instance name>` syntax like so:
+```
+$ singularity exec instance://my-instance cat /etc/os-release
+```
 
 ### Special Characters
 And properly passing along special characters to the program within the container.

pages/docs/user-docs/action-exec.md

@@ -33,6 +33,10 @@ Registry: http://custom_registry
 ```
 The **Registry** keyword is optional.  It will default to `index.docker.io`.
 ```
+Namespace: namespace
+```
+The **Namespace** keyword is optional.  It will default to `library`. 
+```
 IncludeCmd: yes
 ```
 The **IncludeCmd** keyword is optional.  If included, and if a `%runscript` is not specified, a Docker `CMD` will take precedence over `ENTRYPOINT` and will be used as a runscript.  Note that the `IncludeCmd` keyword is considered valid if it is _not empty_!  This means that `IncludeCmd: yes` and `IncludeCmd: no` are identical.  In both cases the `IncludeCmd` keyword is not empty, so the Docker `CMD` will take precedence over an `ENTRYPOINT`.  

pages/docs/user-docs/build-docker-module.md

@@ -30,7 +30,7 @@ Stopping cow1 instance of /home/ubuntu/GodloveD-lolcow-master.img (PID=20522)
 
 ### Stop all running instances
 ```
-$ singularity instance.stop \*
+$ singularity instance.stop --all
 Stopping cow2 instance of /home/ubuntu/GodloveD-lolcow-master.img (PID=20558)
 Stopping hiya instance of /home/ubuntu/vsoch-hello-world-master.img (PID=20595)
 ```

pages/docs/user-docs/docs-instance-stop.md

@@ -15,7 +15,7 @@ A Singularity Recipe is the driver of a custom build, and the starting point for
 A Singularity Recipe file is divided into several parts:
 
 1. **Header**: The Header describes the core operating system to build within the container. Here you will configure the base operating system features that you need within your container. Examples of this include, what distribution of Linux, what version, what packages must be part of a core install.
-2. **Sections**: The rest of the definition is comprised of sections, sometimes called scriptlets or blobs of data. Each section is defined by a `%` character followed by the name of the particular section. All sections are optional.
+2. **Sections**: The rest of the definition is comprised of sections, sometimes called scriptlets or blobs of data. Each section is defined by a `%` character followed by the name of the particular section. All sections are optional. Sections that are executed at build time are executed with the `/bin/sh` interpreter and can accept `/bin/sh` options.  Similarly, sections that produce scripts to be executed at runtime can accept options intended for `/bin/sh`
 
 Please see the [examples](https://github.com/singularityware/singularity/tree/master/examples) directory in the [Singularity source code](https://github.com/singularityware/singularity) for some ideas on how to get started.