Documentation cleanup + make the first letter of Docker uppercase (#148)

.github/ISSUE_TEMPLATE.md

@@ -11,40 +11,34 @@ If it is a bug report:
 If it's not a bug, please remove the template and elaborate the issue in your own words.
 -->
 
-Steps to reproduce
-------------------
+## Steps to reproduce
 
 ```powershell
 
 ```
 
-Expected behavior
------------------
+## Expected behavior
 
 ```none
 
 ```
 
-Actual behavior
----------------
+## Actual behavior
 
 ```none
 
 ```
 
-Environment data
-----------------
+## Environment data
 
 <!-- provide the docker info -->
 
 ```sh
 > docker info
-
 ```
 
 <!-- provide the output of $PSVersionTable from powershell in the docker container -->
 
 ```powershell
 > $PSVersionTable
-
 ```

tests/containerTestCommon.psm1

@@ -58,7 +58,7 @@ function Invoke-Docker
     $dockerExitCode = $LASTEXITCODE
     if($PassThru.IsPresent)
     {
-        Write-Verbose "passing through docker results of length: $($result.length)..." -Verbose
+        Write-Verbose "passing through Docker results of length: $($result.length)..." -Verbose
         return $result
     }
     elseif($dockerExitCode -ne 0 -and $FailureAction -eq 'error')
@@ -77,18 +77,18 @@ function Invoke-Docker
             Write-Warning "*** Last 80 lines of log:"
             $errorTail | ForEach-Object { Write-Warning -Message $_}
 
-            Write-Error "docker $command failed, see $filename ($($result.length))" -ErrorAction Stop
+            Write-Error "Docker $command failed, see $filename ($($result.length))" -ErrorAction Stop
         }
         else
         {
-            Write-Error "docker $command failed with: $resultString  ($($result.length))" -ErrorAction Stop
+            Write-Error "Docker $command failed with: $resultString  ($($result.length))" -ErrorAction Stop
         }
 
         return $false
     }
     elseif($dockerExitCode -ne 0 -and $FailureAction -eq 'warning')
     {
-        Write-Warning "docker $command failed with: $result"
+        Write-Warning "Docker $command failed with: $result"
         return $false
     }
     elseif($dockerExitCode -ne 0)
@@ -207,7 +207,7 @@ function Test-SkipLinux
             return $true
         }
         default {
-            throw "Unknow docker os '$os'"
+            throw "Unknown Docker os '$os'"
         }
     }
 }
@@ -349,7 +349,7 @@ function Get-DockerImageLabel
     return Invoke-Docker -Command inspect -Params $runParams -SuppressHostOutput -PassThru
 }
 
-# Builds a docker image
+# Builds a Docker image
 function Invoke-DockerBuild
 {
     param(