Slightly adjust some README.md files (#3175)

Signed-off-by: Pasta <pasta@dashboost.org>

Author: PastaPastaPasta

README.md

@@ -1,13 +1,13 @@
 Dash Core staging tree 0.14.1
-===============================
+=============================
 
 `master:` [![Build Status](https://travis-ci.org/dashpay/dash.svg?branch=master)](https://travis-ci.org/dashpay/dash) `develop:` [![Build Status](https://travis-ci.org/dashpay/dash.svg?branch=develop)](https://travis-ci.org/dashpay/dash/branches)
 
 https://www.dash.org
 
 
 What is Dash?
-----------------
+-------------
 
 Dash is an experimental digital currency that enables anonymous, instant
 payments to anyone, anywhere in the world. Dash uses peer-to-peer technology

contrib/README.md

@@ -12,7 +12,6 @@ Tool to verify that every merge commit was signed by a developer using the above
 Construct a linear, no-fork, best version of the blockchain.
 
 ### [Qos](/contrib/qos) ###
-
 A Linux bash script that will set up traffic control (tc) to limit the outgoing bandwidth for connections to the Dash network. This means one can have an always-on dashd instance running, and another local dashd/dash-qt instance which connects to this node and receives blocks from it.
 
 ### [Seeds](/contrib/seeds) ###
@@ -29,7 +28,7 @@ for Debian-based Linux systems. If you compile dashd/dash-qt yourself, there are
 Notes on getting Gitian builds up and running using KVM.
 
 ### [Gitian-keys](/contrib/gitian-keys)
-PGP keys used for signing Bitcoin Core [Gitian release](/doc/release-process.md) results.
+PGP keys used for signing Dash Core [Gitian release](/doc/release-process.md) results.
 
 ### [MacDeploy](/contrib/macdeploy) ###
 Scripts and notes for Mac builds. 

contrib/devtools/README.md

@@ -112,7 +112,7 @@ For example:
   ./github-merge.py 3077
 
 (in any git repository) will help you merge pull request #3077 for the
-bitcoin/bitcoin repository.
+dashpay/dash repository.
 
 What it does:
 * Fetch master and the pull request.
@@ -132,14 +132,14 @@ Setup
 ---------
 Configuring the github-merge tool for the bitcoin repository is done in the following way:
 
-    git config githubmerge.repository bitcoin/bitcoin
+    git config githubmerge.repository dashpay/dash
     git config githubmerge.testcmd "make -j4 check" (adapt to whatever you want to use for testing)
     git config --global user.signingkey mykeyid (if you want to GPG sign)
 
 optimize-pngs.py
 ================
 
-A script to optimize png files in the bitcoin
+A script to optimize png files in the dash
 repository (requires pngcrush).
 
 security-check.py and test-security-check.py