Spell-check the documentation.

Changes include a few typos, a few capitalization changes, and a lot of hyphenation of compound words that were not as widely used as I thought.

docs/interface/common.md

@@ -5,7 +5,7 @@ Sometimes higan will need you
 to choose a file or folder.
 For this, it uses a special Filesystem Browser dialog.
 Although many operating systems provide a native filesystem browser,
-they do not all allow the same customizations.
+they do not all allow the same customisations.
 Therefore,
 higan provides its own filesystem browser
 that works the same way on every platform.
@@ -55,7 +55,7 @@ you can choose one
 by selecting it and clicking the "Select" button in the bottom-right.
 Double-clicking
 or selecting and pressing Enter don't work,
-they just switch to viewing the conents of that folder.
+they just switch to viewing the contents of that folder.
 
 The "Cancel" button in the bottom-right
 closes the filesystem browser without selecting anything.

docs/interface/higan-settings.md

@@ -30,7 +30,7 @@ of the emulated console's video output:
     This is in addition to
     any adjustment applied by
     the "Colors" option
-    in the "Video Emulation" submenu
+    in the "Video Emulation" sub-menu
     of the [Settings menu](higan.md#the-settings-menu).
   - **Luminance** adjusts the overall brightness,
     where 100% is normal,
@@ -87,7 +87,7 @@ in a normal window.
     whenever it changes size
     (because the user loaded a game for a different console,
     chose a different option from
-    the [Video Scale submenu](higan.md#the-settings-menu),
+    the [Video Scale sub-menu](higan.md#the-settings-menu),
     toggled Aspect Correction, etc.)
     When disabled,
     higan generally respects manual resizing.

docs/interface/higan.md

@@ -8,7 +8,7 @@ the running game's video output.
 The Library menu
 ----------------
 
-Manufacturer submenus
+Manufacturer sub-menus
 allow you to play
 games you've already imported
 into higan's 
@@ -145,7 +145,7 @@ that aren't technically part of the console itself:
 how the low-resolution video output of the emulated console
 is scaled up to suit modern high-resolution displays.
 [Using video shaders](../guides/shaders.md)
-describes all the options in this submenu.
+describes all the options in this sub-menu.
 
 **Synchronize Audio**
 causes higan to wait for audio playback to complete
@@ -154,7 +154,7 @@ This should reduce popping and glitching noises,
 and slows the emulation down to approximately the correct speed.
 If your PC cannot emulate at full-speed,
 (60fps for most consoles, 75fps for WonderSwan)
-this has no noticable effect.
+this has no noticeable effect.
 
 **Mute Audio**
 causes higan to not output sound from the emulated console.
@@ -236,7 +236,7 @@ Before any game is loaded,
 the status bar displays "No cartridge loaded".
 
 When a game is loaded and running,
-the status bar displays the current emulation speeed
+the status bar displays the current emulation speed
 in frames-per-second.
 For PAL-based consoles,
 this should be around 50 FPS for "full speed" emulation,
@@ -271,7 +271,7 @@ The status bar briefly displays "Slot X quick state does not exist"
 (where X is one of the Quick State slot numbers)
 when you choose a slot from the
 [Tools](#the-tools-menu) → "Load Quick State"
-submenu that has not had a save-state saved to it,
+sub-menu that has not had a save-state saved to it,
 or when you press the "Load Quick State" hotkey
 while the current Quick State slot has not had a save-state saved to it,
 

docs/interface/icarus.md

@@ -60,7 +60,7 @@ The icarus Settings dialog contains the following settings:
     if it's importing a game it recognises.
     For unrecognised games,
     and for all games if this box is unticked,
-    icarus gueses the manifest data.
+    icarus guesses the manifest data.
     This option is still relevant when "Create Manifests" is unticked:
     higan uses icarus to generate a manifest when a game is loaded,
     not just at import-time.