Fixed a couple of typos

docs/libcurl/curl_easy_setopt.3

@@ -587,7 +587,7 @@ standard Unix ftp client does). It should only be readable by user.
 Pass a char * as parameter, pointing to a zero terminated string containing
 the full path name to the file you want libcurl to use as .netrc file. If this
 option is omitted, and \fICURLOPT_NETRC\fP is set, libcurl will attempt to
-find the a .netrc file in the current user's home directory. (Added in 7.10.9)
+find a .netrc file in the current user's home directory. (Added in 7.10.9)
 .IP CURLOPT_USERPWD
 Pass a char * as parameter, which should be [user name]:[password] to use for
 the connection. Use \fICURLOPT_HTTPAUTH\fP to decide authentication method.
@@ -710,7 +710,7 @@ This option is deprecated and starting with version 7.12.1 you should instead
 use \fICURLOPT_UPLOAD\fP.
 .IP CURLOPT_POST
 A parameter set to 1 tells the library to do a regular HTTP post. This will
-also make the library use the a "Content-Type:
+also make the library use a "Content-Type:
 application/x-www-form-urlencoded" header. (This is by far the most commonly
 used POST method).
 
@@ -1575,7 +1575,7 @@ CURLSSH_AUTH_KEYBOARD. Set CURLSSH_AUTH_ANY to let libcurl pick one.
 (Added in 7.16.1)
 .IP CURLOPT_SSH_HOST_PUBLIC_KEY_MD5
 Pass a char * pointing to a string containing 32 hexadecimal digits. The
-string should be the 128 bit MD5 cheksum of the remote host's public key, and
+string should be the 128 bit MD5 checksum of the remote host's public key, and
 libcurl will reject the connection to the host unless the md5sums match. This
 option is only for SCP and SFTP transfers. (Added in 7.17.1)
 .IP CURLOPT_SSH_PUBLIC_KEYFILE