Changed the intentional spelling errors back to the original, made more slight grammar corrections

[lebedev.ri]

:)

clang/include/clang/StaticAnalyzer/Checkers/CheckerBase.td

 def Boolean : CmdLineOptionTypeEnum<2>;
 
 /// Describes the state of the entry. We wouldn't like to display, for example,
 /// developer only entries for a list meant for end users.
 class DevelopmentStageEnum<bits<1> val> {
   bits<1> Val = val;
 }
 
-/// Alpha entries are under development, might be incomplete, incorrect and
+/// Alpha entries are under development, might be incomplet, inkorrekt and
 /// unstable.
 def InAlpha : DevelopmentStageEnum<0>;
 
 /// Released entries are stable, produce minimal, if any false positives,
-/// and emits reports that explain the occurance of the bug understandably and
+/// and emits reports that explain the occurrence of the bug understandably and
 /// thoroughly.
 def Released : DevelopmentStageEnum<1>;
 
 /// Marks the entry hidden. Hidden entries won't be displayed in
 /// -analyzer-checker-option-help.
 class HiddenEnum<bit val> {
   bit Val = val;
 }