Fix typos

doc/Doxyfile

@@ -870,7 +870,7 @@ HTML_FILE_EXTENSION    = .html
 # standard header. Note that when using a custom header you are responsible 
 # for the proper inclusion of any scripts and style sheets that doxygen 
 # needs, which is dependent on the configuration options used. 
-# It is adviced to generate a default header using "doxygen -w html 
+# It is advised to generate a default header using "doxygen -w html 
 # header.html footer.html stylesheet.css YourConfigFile" and then modify 
 # that header. Note that the header is subject to change so you typically 
 # have to redo this when upgrading to a newer version of doxygen or when

src/gtest/test_mempool.cpp

@@ -248,7 +248,7 @@ TEST(Mempool, SproutNegativeVersionTxWhenOverwinterActive) {
     mtx.vjoinsplit.resize(0); // no joinsplits
     mtx.fOverwintered = false;
 
-    // A Sprout transaction with version -3 is created using Sprout code (as found in Zcashd <= 1.0.14).
+    // A Sprout transaction with version -3 is created using Sprout code (as found in zcashd <= 1.0.14).
     // First four bytes of transaction, parsed as an uint32_t, has the value: 0xfffffffd
     // This test simulates an Overwinter node receiving this transaction, but incorrectly deserializing the
     // transaction due to a (pretend) bug of not detecting the most significant bit, which leads
@@ -266,7 +266,7 @@ TEST(Mempool, SproutNegativeVersionTxWhenOverwinterActive) {
         EXPECT_EQ(state1.GetRejectReason(), "bad-txns-version-too-low");
     }
 
-    // A Sprout transaction with version -3 created using Overwinter code (as found in Zcashd >= 1.0.15).
+    // A Sprout transaction with version -3 created using Overwinter code (as found in zcashd >= 1.0.15).
     // First four bytes of transaction, parsed as an uint32_t, has the value: 0x80000003
     // This test simulates the same pretend bug described above.
     // The resulting Sprout tx with nVersion -2147483645 should be rejected by the Overwinter node's mempool.

zcutil/build.sh

@@ -41,7 +41,7 @@ if [[ -z "${CXX-}" ]]; then
     CXX=g++
 fi
 
-# Allow users to set arbitary compile flags. Most users will not need this.
+# Allow users to set arbitrary compile flags. Most users will not need this.
 if [[ -z "${CONFIGURE_FLAGS-}" ]]; then
     CONFIGURE_FLAGS=""
 fi