Merge pull request #409 from Niederb/master

Three small improvements

README.md

@@ -94,7 +94,7 @@ would be:
 ```bash
 mkdir build
 cd build
-cmake .. [-DAMQP-CPP_BUILD_SHARED] [-DAMQP-CPP_LINUX_TCP]
+cmake .. [-DAMQP-CPP_BUILD_SHARED=ON] [-DAMQP-CPP_LINUX_TCP=ON]
 cmake --build . --target install
 ```
 

src/linux_tcp/openssl.cpp

@@ -102,7 +102,7 @@ int SSL_read(SSL *ssl, void *buf, int num)
 }
 
 /**
- *  Read data from an ssl socket
+ *  Write data to an ssl socket
  *  @param  ssl     ssl structure
  *  @param  buf     buffer to write
  *  @param  num     size of buffer