[doc] Fix typos

doc/build-unix.md

@@ -7,7 +7,7 @@ Some notes on how to build Bitcoin Core in Unix.
 Note
 ---------------------
 Always use absolute paths to configure and compile bitcoin and the dependencies,
-for example, when specifying the the path of the dependency:
+for example, when specifying the path of the dependency:
 
 	../dist/configure --enable-cxx --disable-shared --with-pic --prefix=$BDB_PREFIX
 

doc/shared-libraries.md

@@ -11,7 +11,7 @@ The interface is defined in the C header `bitcoinconsensus.h` located in  `src/s
 
 #### Version
 
-`bitcoinconsensus_version` returns an `unsigned int` with the the API version *(currently at an experimental `0`)*.
+`bitcoinconsensus_version` returns an `unsigned int` with the API version *(currently at an experimental `0`)*.
 
 #### Script Validation
 

doc/travis-ci.txt

@@ -27,7 +27,7 @@ In order to avoid rebuilding all dependencies for each build, the binaries are
 cached and re-used when possible. Changes in the dependency-generator will
 trigger cache-invalidation and rebuilds as necessary.
 
-These caches can be manually removed if necessary. This is one of the the very few
+These caches can be manually removed if necessary. This is one of the very few
 manual operations that is possible with Travis, and it can be done by the
 Bitcoin Core committer via the Travis web interface.