Fixes from the SpellingMistakes page.

doc/manual/manual.txt

@@ -427,7 +427,7 @@ using the Preferences menu.
 F1             The Battle for Wesnoth Help
 Arrow keys     Scroll
 Left click     Select unit, move unit
-Right click    Main menu, cancel action
+Right click    Context menu, cancel action
 Middle click   Center on pointer location
 Escape         Exit game, exit menu, cancel message
 Ctrl-r         Recruit unit
@@ -920,8 +920,8 @@ weapons, such as swords, are melee weapons, and some weapons, such as
 bows, are ranged weapons.
 
 If you attack with a melee weapon, the enemy you attack will be able to
-strike back at you with its melee weapon. If you attack with a ranged
-weapon, the enemy will be able to strike back with its ranged weapon. If
+strike back at you with a melee weapon. If you attack with a ranged
+weapon, the enemy will be able to strike back with a ranged weapon. If
 an enemy does not have a weapon of the same type as the one you attack
 with, they will be unable to strike back and do any damage to you in
 that fight.
@@ -1250,7 +1250,7 @@ At the start of a scenario
 
  - First, read the scenario objectives. Sometimes you do not have to
    kill enemy leaders; instead it is enough that you survive for a
-   certain number of turns, or pick up a particular object
+   certain number of turns, or pick up a particular object.
  - Look at the map: the terrain, the position of your leader and the
    other leader(s).
  - Then, begin to recruit units. Cheap units are useful to soak up the
@@ -1315,7 +1315,7 @@ More general tips
 
  - After slaughtering scenarios (where you take lots of punishment) there
    are usually "breathing room" scenarios where you can rather easily
-   gain some gold and experience (advanced units)
+   gain some gold and experience (advanced units).
  - Advanced units have higher upkeep than lower level units (1 gp per
    level), loyal units are an exception.