revert case of two keywords for the time being,

until the start-of-sentence keyword casing (#23)
can be chosen consistently one or another way.

sicp-pocket.texi

@@ -1916,7 +1916,7 @@ Another way to write the absolute-value procedure is
 
 @noindent
 which could be expressed in English as ``If @math{x} is less than zero return 
-@math{{-x}}; otherwise return @math{x}.''  @code{else} is a special symbol that can be
+@math{{-x}}; otherwise return @math{x}.''  @code{Else} is a special symbol that can be
 used in place of the @math{{⟨p⟩}} in the final clause of a @code{cond}.  This
 causes the @code{cond} to return as its value the value of the corresponding
 @math{{⟨e⟩}} whenever all previous clauses have been bypassed.  In fact, any
@@ -2530,7 +2530,7 @@ variable @code{abs}.  It would have changed from free to bound.)  The meaning
 of @code{good-enough?} is not independent of the names of its free variables,
 however.  It surely depends upon the fact (external to this definition) that
 the symbol @code{abs} names a procedure for computing the absolute value of a
-number.  @code{good-enough?} will compute a different function if we substitute
+number.  @code{Good-enough?} will compute a different function if we substitute
 @code{cos} for @code{abs} in its definition.
 
 @subsubheading Internal definitions and block structure