(Breaking) Fonts: removed ImFontConfig::GlyphExtraSpacing option which seems largely obsolete and unused. (#242)

docs/CHANGELOG.txt

@@ -41,6 +41,9 @@ HOW TO UPDATE?
 
 Breaking changes:
 
+- Removed ImFontConfig::GlyphExtraSpacing option which seems largely obsolete and
+  unused. If you were using this please report it! (#242).
+
 Other changes:
 
 - Fixed IsItemDeactivatedAfterEdit() signal being broken for Checkbox(),

docs/FONTS.md

@@ -110,7 +110,7 @@ ImGui::PopFont();
 **For advanced options create a ImFontConfig structure and pass it to the AddFont() function (it will be copied internally):**
 ```cpp
 ImFontConfig config;
-config.GlyphExtraSpacing.x = 1.0f;
+config.RasterizerDensity = 2.0f;
 ImFont* font = io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, &config);
 ```