Review examples against option substitution.

Co-authored-by: pancho horrillo <pedrofelipe.horrillo@bbva.com>

docs/source/tutorial/tutorial03.rst

@@ -47,9 +47,9 @@ We need to filter
 
   .. code-block:: sh
 
-     kapow route add /db/backup_logs -e grep "$(kapow get /request/params/filter)" /var/log/backup_db.log \
+     kapow route add /db/backup_logs -c 'grep -- "$(kapow get /request/params/filter)" /var/log/backup_db.log \
        | tail -n "$(kapow get /request/params/lines)" \
-       | kapow set /response/body
+       | kapow set /response/body'
 
   It looks a bit weird but we'll have time to re-styling later.  Please make
   some tests on your laptop before to publish on the *Corporate Server*.

docs/source/tutorial/tutorial04.rst

@@ -131,14 +131,14 @@ I Need My Report
 
   .. code-block:: console
 
-     $ cat <<HERE
+     $ cat <<'EOF'
         you can put
         more than one line
         here
-       HERE
+       EOF
   
-  The shell will put the data between the first ``HERE`` and the second
-  ``HERE`` as the ``stdin`` of the ``cat`` process.
+  The shell will put the data between the first ``EOF`` and the second
+  ``EOF`` as the ``stdin`` of the ``cat`` process.
 
 **Junior**
 
@@ -150,7 +150,7 @@ I Need My Report
 
   .. code-block:: bash
 
-     kapow route add /capacityreport - <<-HERE
+     kapow route add /capacityreport - <<-'EOF'
          hostname | kapow set /response/body
          echo ================================================================================ | kapow set /response/body
          date | kapow set /response/body
@@ -161,7 +161,7 @@ I Need My Report
          echo ================================================================================ | kapow set /response/body
          df -h | kapow set /response/body
          echo ================================================================================ | kapow set /response/body
-     HERE
+     EOF
 
 **Senior**
 
@@ -195,7 +195,7 @@ I Need My Report
 
   .. code-block:: bash
 
-     kapow route add /capacityreport - <<-HERE
+     kapow route add /capacityreport - <<-'EOF'
          {
          hostname
          echo ================================================================================
@@ -208,7 +208,7 @@ I Need My Report
          df -h
          echo ================================================================================
          } | kapow set /response/body
-     HERE
+     EOF
 
 **Senior**
 

docs/source/tutorial/tutorial05.rst

@@ -40,9 +40,9 @@ Sharing the Stats
 
   .. code-block:: bash
 
-     kapow route add /capacitystats - <<-HERE 
+     kapow route add /capacitystats - <<-'EOF'
        echo "{\"memory\": \"`free -m`\"}"  | kapow set /response/body
-     HERE
+     EOF
 
 **Senior**
 
@@ -145,7 +145,7 @@ Sharing the Stats
 
   .. code-block:: bash
 
-     kapow route add /capacitystats - <<-HERE 
+     kapow route add /capacitystats - <<-'EOF'
        jq -n \
           --arg hostname "$(hostname)" \
           --arg date "$(date)" \
@@ -154,7 +154,7 @@ Sharing the Stats
           --arg disk "$(df -h)" \
           '{"hostname": $hostname, "date": $date, "memory": $memory, "load": $load, "disk": $disk}' \
        | kapow set /response/body
-     HERE
+     EOF
 
   What do you think?
    
@@ -179,7 +179,7 @@ Sharing the Stats
 
   .. code-block:: bash
 
-     kapow route add /capacitystats - <<-HERE 
+     kapow route add /capacitystats - <<-'EOF'
        jq -n \
           --arg hostname "$(hostname)" \
           --arg date "$(date)" \
@@ -189,7 +189,7 @@ Sharing the Stats
           '{"hostname": $hostname, "date": $date, "memory": $memory, "load": $load, "disk": $disk}' \
        | kapow set /response/body
        echo application/json | kapow set /response/headers/Content-Type
-     HERE
+     EOF
 
 **Senior**
 
@@ -211,7 +211,7 @@ Sharing the Stats
 
   .. code-block:: bash
 
-     kapow route add /capacitystats - <<-HERE 
+     kapow route add /capacitystats - <<-'EOF'
        kapow set /response/headers/Content-Type application/json
        jq -n \
           --arg hostname "$(hostname)" \
@@ -221,7 +221,7 @@ Sharing the Stats
           --arg disk "$(df -h)" \
           '{"hostname": $hostname, "date": $date, "memory": $memory, "load": $load, "disk": $disk}' \
        | kapow set /response/body
-     HERE
+     EOF
 
 **Senior**