[pitivi] docs: Update command line tools info

[Alexandru Băluț <alexbalut src gnome org>]

commit 93321c51160d2d89cc810ade83ea4d26bfc44952
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Fri Dec 22 10:53:05 2017 +0100

    docs: Update command line tools info
    
    Differential Revision: https://phabricator.freedesktop.org/D1924

 docs/Command_line_tools.md |  101 +++++++++++--------------------------------
 1 files changed, 26 insertions(+), 75 deletions(-)
---
diff --git a/docs/Command_line_tools.md b/docs/Command_line_tools.md
index fce7c01..e4f5ed4 100644
--- a/docs/Command_line_tools.md
+++ b/docs/Command_line_tools.md
@@ -1,6 +1,6 @@
 # Command line tools
 
-This is a list of tools to use for developing Pitivi.
+This is a list of tools useful when developing Pitivi.
 
 # Commands
 
@@ -8,97 +8,48 @@ This is a list of tools to use for developing Pitivi.
 
 Used to play back xges files and render them.
 
-`# Render project.xges to video.ogv.`\
-`$ ges-launch-1.0 -l project.xges -o video.ogv`
+```
+# Render project.xges to video.ogv.
+$ ges-launch-1.0 -l project.xges -o video.ogv
+```
 
 ## gst-launch
 
 Launches GStreamer pipelines.
 
-`# Play a video with the decodebin`\
-`$ gst-launch-1.0 filesrc location=foo.ogv ! decodebin ! autovideosink`
+```
+# Play a video with the decodebin
+$ gst-launch-1.0 filesrc location=foo.ogv ! decodebin ! autovideosink
+```
 
 ## gst-inspect
 
 Lists installed GStreamer plugins.
 
-`# Find all plugins containing `“`2000`”\
-`$ gst-inspect-1.0 | grep 2000`
+```
+# Find all plugins containing "2000"
+$ gst-inspect-1.0 | grep 2000
+```
 
-`# List details of matroskamux`\
-`$ gst-inspect-1.0 matroskamux`
+```
+# List details of matroskamux
+$ gst-inspect-1.0 matroskamux
+```
 
 ## gst-discoverer
 
-Prints information of a media file.
+Prints information about a media file.
 
-`# Print info of foo.mp3`\
-`$ gst-discoverer-1.0 foo.mp3`
+```
+# Print info about foo.mp3
+$ gst-discoverer-1.0 foo.mp3
+```
 
 ## gst-validate-launcher
 
 Launches gst validate test suites.
 
-`# -t enables blacklisted tests`\
-`$ gst-validate-launcher -t ges.playback.*`
-
-# Building
-
-## cerbero
-
-The GStreamer build system. Used to compile the Pitivi bundle builds or
-the GStreamer SDK.
-
-`# Build Pitivi with dependencies`\
-`$ cerbero build pitivi`
-
-## Pitivi build environment
-
-Builds Pitivi in an own environment
-
-`# Open shell in Pitivi environment`\
-`$ ./bin/pitivi-git-environment.sh`
-
-`# Update git repos and build everything`\
-`$ ./bin/pitivi-git-environment.sh --build`
-
-To build less packages the script checks if a sufficient GStreamer
-release is installed in your system. To build a git master version in
-this case, you need to set this value to a higher version:
-
-in bin/pitivi-git-evironment.sh:
-
-`DEFAULT_GST_VERSION=`“`1.6`”
-
-# Debugging
-
-## GST\_DEBUG
-
-If you want debug information to be printed in general, you have to use
-the GST\_DEBUG envoirement variable. Execute commands like so:
-
-`$ GST_DEBUG=3 gst-launch-1.0 videotestsrc ! autovideosink`
-
-You can also filter the debug categories
-
-`$ GST_DEBUG=audiotestsrc:5 gst-launch-1.0 videotestsrc ! autovideosink`
-
-## Pipeline graph
-
-You need graphviz installed for this.
-
-`$ GST_DEBUG_DUMP_DOT_DIR=/tmp/ gst-launch-1.0 videotestsrc ! autovideosink`
-
-Now you can convert the dot files to png:
-
-`$ dot -Tpng file.dot -o file.png`
-
-## gdb
-
-The GNU debugger. A C debugger.
-
-To debug a segfault, you need following syntax to run gdb:
-
-`$ gdb --args python ./bin/pitivi`
-
-`$ gdb --args sh ges-launch-1.0 -l project.xges`
+```
+# -t enables blacklisted tests
+$ gst-validate-launcher -t ges.playback.*
+```