Fix typos in PuTTYgen docs.

doc/man-puttygen.but

@@ -75,7 +75,7 @@ OpenSSH format, or the standard SSH-1 format.
 \dt \cw{\-\-primes} \e{method}
 
 \dd Method for generating prime numbers. The acceptable values here
-are \c{probable} (the default), \c{proven}, and \c{proven-even}; the
+are \c{probable} (the default), \c{proven}, and \c{proven-even};
 the later methods are slower. (Various synonyms for these method
 names are also accepted.)
 
@@ -99,7 +99,7 @@ probabilistic argument for the safety of the usual method.
 
 }
 
-\dd \cw{\-\-strong-rsa}
+\dt \cw{\-\-strong-rsa}
 
 \dd When generating an RSA key, make sure the prime factors of the key
 modulus are \q{strong primes}. A strong prime is a prime number chosen

doc/pubkey.but

@@ -153,7 +153,7 @@ The prime-generation method does not affect compatibility: a key
 generated with any of these methods will still work with all the same
 SSH servers.
 
-If you don't care abut this, it's entirely sensible to leave it on the
+If you don't care about this, it's entirely sensible to leave it on the
 default setting.
 
 The available methods are: