Fixed one typo ("[[=e]]" -> "[[=e=]]") and two occurences of whitespace

before a macro.

PR:		docs/7833
Submitted by:	Kazuo Horikawa <k-horik@yk.rim.or.jp>

contrib/awk/doc/awk.1

@@ -1213,13 +1213,13 @@ For example, the name
 might be used to represent all of
 ``e,'' ``e\`,'' and ``e\`.''
 In this case,
-.B [[=e]]
+.B [[=e=]]
 is a regexp
 that matches any of
- .BR e ,
- .BR e\' ,
+.BR e ,
+.BR e\' ,
 or
- .BR e\` .
+.BR e\` .
 .PP
 These features are very valuable in non-English speaking locales.
 The library functions that