Update CONTRIBUTING.md – removed invisible characters messing up Markdown...

Update CONTRIBUTING.md – removed invisible characters messing up Markdown heading parsing on GitLab.

CONTRIBUTING.md

@@ -4,7 +4,7 @@ Thank you for your interest in contributing to Better.
 
 Better is licensed under AGPLv3. However, we also ask that you to sign a contributor license agreement (CLA) before we can accept your contributions.
 
-## Why a CLA? (In human speak)
+## Why a CLA? (In human speak)
 
 *This is a human-readable summary of (and not a substitute for) the [Contributor License Agreement](#contributor-license-agreement).*
 
@@ -48,13 +48,13 @@ This contributor agreement ("Agreement") documents the rights granted by contrib
 
 ### 2. Grant of Rights
 
-#### 2.1 Copyright License
+#### 2.1 Copyright License
 
 (a) You retain ownership of the Copyright in Your Contribution and have the same rights to use or license the Contribution which You would have had without entering into the Agreement.
 
 (b) To the maximum extent permitted by the relevant law, You grant to Us a perpetual, worldwide, non-exclusive, transferable, royalty-free, irrevocable license under the Copyright covering the Contribution, with the right to sublicense such rights through multiple tiers of sublicensees, to reproduce, modify, display, perform and distribute the Contribution as part of the Material; provided that this license is conditioned upon compliance with Section 2.3.
 
-#### 2.2 Patent License
+#### 2.2 Patent License
 
 For patent claims including, without limitation, method, process, and apparatus claims which You own, control or have the right to grant, now or in the future, You grant to Us a perpetual, worldwide, non-exclusive, transferable, royalty-free, irrevocable patent license, with the right to sublicense these rights to multiple tiers of sublicensees, to make, have made, use, sell, offer for sale, import and otherwise transfer the Contribution and the Contribution in combination with the Material (and portions of such combination). This license is granted only to the extent that the exercise of the licensed rights infringes such patent claims; and provided that this license is conditioned upon compliance with Section 2.3.
 
@@ -66,7 +66,7 @@ Based on the grant of rights in Sections 2.1 and 2.2, if We include Your Contrib
 
 If moral rights apply to the Contribution, to the maximum extent permitted by law, You waive and agree not to assert such moral rights against Us or our successors in interest, or any of our licensees, either direct or indirect.
 
-#### 2.5 Our Rights
+#### 2.5 Our Rights
 
 You acknowledge that We are not obligated to use Your Contribution as part of the Material and may decide to include any Contribution We consider appropriate.
 
@@ -74,7 +74,7 @@ You acknowledge that We are not obligated to use Your Contribution as part of th
 
 Any rights not expressly licensed under this section are expressly reserved by You.
 
-### 3. Agreement
+### 3. Agreement
 
 You confirm that: