Fix minor documentation errors

Headers/GNUstepBase/NSLock+GNUstepBase.h

@@ -44,7 +44,7 @@ extern "C" {
  * IDENT is considered uninitialized, if it contains nil.
  * CLASSNAME must be either NSLock, NSRecursiveLock or one
  * of their subclasses.
- * See [NSLock+newLockAt:] for details.
+ * See [NSLock(GNUstepBase)+newLockAt:] for details.
  * This macro is intended for code that cannot insure
  * that a lock can be initialized in thread safe manner otherwise.
  * <example>

Headers/GNUstepBase/NSObject+GNUstepBase.h

@@ -112,9 +112,9 @@ extern "C" {
 @end
 
 /** This is an informal protocol; classes may implement the
- * +contentSizeOf:declaredIn:excluding: method to report how much memory
+ * +contentSizeOf:excluding: method to report how much memory
  * is used by any objects/pointers it acts as a container for.<br />
- * Code may call the -sizeInBytesExcluding: or -sizeinBytes method to
+ * Code may call the -sizeInBytesExcluding: or -sizeInBytes method to
  * determine how much heap memory an object (and its content) occupies.
  */
 @interface      NSObject(MemoryFootprint)
@@ -186,7 +186,7 @@ extern "C" {
  * is immutable or if locking is used to prevent mutation while calculating
  * content size).<br />
  * Subclasses may use the +contentSizeOf:excluding: method as a convenience
- * to provide the sizes of object instnce variables.
+ * to provide the sizes of object instance variables.
  */
 - (NSUInteger) sizeOfContentExcluding: (NSHashTable*)exclude;
 
@@ -271,9 +271,9 @@ extern "C" {
 + (BOOL) registerAtExit: (SEL)aSelector;
 
 /** Specifies the default cleanup behavior on process exit ... the value
- * returned by the NSObject implementation of the +shouldClanUp method.<br />
- * Calling this method with a YES argument implicitly calls the +enableAtExit
- * method as well.<br />
+ * returned by the NSObject implementation of the +shouldCleanUp method.<br />
+ * Calling this method with a YES argument implicitly enables the support for
+ * cleanup at exit.<br />
  * The GNUstep Base library calls this method with the value obtained from
  * the GNUSTEP_SHOULD_CLEAN_UP environment variable when NSObject is
  * initialised.